4.1. Student Factors That Have an Impact on Science and Math Achievement
The findings of the multiple linear regression model in
Table 4 and
Table 5 showed that there is a non-significant correlation between gender and mathematics and science achievement. This finding is similar to Boz, Yerdelen-Damar and Belge-Can’s [
22], who stated that there was no direct relationship between student gender and science achievement. This finding is inconsistent with a study of Saudi Arabia, which found that the mathematics achievement of girls is better than that of boys [
15]. Furthermore, it is not consistent with the Jordanian TIMSS results, as Innabi and Dodeen [
16] indicated that girls performed better than boys in TIMSS 2015. A possible reason for the higher achievement of girls than boys might be that girls’ confidence in learning is greater than that of boys [
20], while boys may not show all their knowledge in exams [
60]. Furthermore, girls study hard to understand the material of the subject, while boys only focus on their performance [
61]. Another reason could be because women in the UAE have the same rights as men, and they have access to education, different careers, social benefits and government office [
62]. Furthermore, the UAE National Agenda, Vision 2021, aimed to reduce inequality, including gender imbalance [
4]. In UAE TIMSS 2019, there was a significant difference of 9 points in favor of UAE boys in mathematics. For science, in the TIMSS 2019, girls performed better than boys by 4 points [
54]. This needs further study on the differences in gender in TIMSS 2019 and the factors that might cause these differences, and how we can improve our teaching pedagogies based on this understanding of the genders in TIMSS 2019. It was expected that having breakfast on school days would have a positive association with mathematics and science results. The results matched Hjorth et al. [
12], who concluded that students who do not eat breakfast daily had lower scores in cognitive assessments. Furthermore, Burrows et al. [
7] concluded that balanced dietary behaviors are associated with better academic performance. McIsaac, Kirk and Kuhle [
11] stated that an unhealthy lifestyle for elementary students would lead to poor academic performance in mathematics. The healthy lifestyle could be linked to students’ socioeconomic status. The economic affluence of homes was associated with student achievement [
63]. Higher student achievement was associated with affluent students rather than the disadvantaged ones [
64], and children from families with lower socioeconomic status performed more poorly in elementary schools than the children with higher socioeconomic status [
65].
It was anticipated that bullying would have a negative association with mathematics and science achievement. The results were consistent with those of Al-Raqqad et al. [
34], who stated that bullying had negative effects on students’ academic performance. In the same vein, Strom et al. [
33] concluded that schools with a high incidence of bullying show lowered academic performance.
The linear regression model showed that the factor of liking learning mathematics had a negative association with TIMSS 2015 mathematics student performance. On the other hand, as expected, the factor of liking learning science had a positive association with student performance. Liking learning is referred to as the students’ desire to learn, which could be defined as motivation [
66]. Students’ motivation influences their beliefs, interest, and attitudes [
26], which could result in a positive effect on student attainment. Students will learn better when they believe that subjects will benefit them, when they are interested in classroom activities, and when they have a positive attitude to learning in school.
Engagement in mathematics lessons demonstrated a positive association with student performance, while engagement in science lessons showed an insignificant association. The findings of the current study of the positive association between student engagement and mathematics achievement were similar to some studies in the literature. House and Telese [
42] indicated that there is a significant positive relationship between students’ engagement and their academic achievement in Korean TIMSS 2011 results. Furthermore, Moreira et al. [
67] stated that higher-achieving students show higher cognitive engagement.
For the insignificant association between the engagement in science lessons and student performance, the explanations for these findings might be related to ineffective teaching strategies that were implemented in science classes. Littledyke [
68] stated that students might have a negative attitude toward learning science when the concept is not linked to their experiences through the integration of the cognitive and affective domains.
The positive association with the confidence in learning and student achievement was similar to a number of studies in the literature. Mohammadpour, Kalantarrashidi and Shekarchizadeh [
30] stated that students’ science achievement depended greatly on student factors such as self-confidence, Guay et al. [
69] stated that primary school self-concept had an impact on academic achievement, and Sewasew and Schroeders [
28] noted that there is a positive relationship between academic self-concept and standardized assessment results.
A possible reason for the positive association between confidence in learning and academic performance is that it is linked to student motivation. Guay et al. [
69] illustrated that academic self-concept was associated with student motivation. When students are interested in learning mathematics and science, they will be able to follow the classroom activities and understand the teacher’s expectations.
4.2. The Relationships between Student Factors and the Content and Cognitive Domains of Mathematics and Science in TIMSS 2015
Structural Equation Modeling (SEM) analysis was conducted (see
Table 6,
Table 7,
Table 8 and
Table 9 and
Figure 2,
Figure 3,
Figure 4 and
Figure 5). The SEM analysis showed that there were differences between the genders in the performance in the specific content and cognitive domains. Girls performed better than boys in the content domains of Data Display and Geometry, while boys performed better in the Number and Applying questions. For science, girls performed better than boys in Life Science, Applying, and Reasoning questions, while boys performed better in Earth Science and Physics.
Studies in the literature indicated different findings from the current study in the content domains of mathematics. Stewart et al. [
70] stated that there are no significant differences between male and female achievement in the areas of math calculation, geometric concepts, basic math concepts, and addition error factors. Furthermore, a study of the content domain of Data and Chance in the United States concluded that boys outperformed girls [
71].
The current study concluded that there was an insignificant association between gender and the Reasoning cognitive domain questions. However, studies in the literature indicated that boys performed better in the Reasoning cognitive domain tasks. Stewart et al. [
70] stated that boys outperformed girls in complex real-life problem situations. In Jordan, boys were more likely than girls to correctly answer complex, unfamiliar, real-life situations mathematics questions, while girls were more likely to obtain the correct answer for familiar and less-difficult questions [
16].
It was difficult to find reasons for the differences in performance between genders in the specific content and cognitive domains. An argument provided by George and Robitzsch [
51] about gender differences in specific content and cognitive domains stated that question items should be treated as a combination of both, rather than one domain by itself. The interaction effect of the content and cognitive domains could explain the significant differences between the genders which were not contemplated in a specific domain TIMSS analysis [
51].
SEM analysis indicated that when the students had breakfast every school day it had a positive effect on the content domains and cognitive domains of mathematics and science. Having breakfast on school days improves students’ abilities by maintaining a balanced dietary lifestyle, which is associated with better cognitive skills and academic achievement [
10]. It is therefore very important to support healthy diet behavior in order to help improve students’ academic achievement [
11].
The study showed that when the students had been bullied in school, their achievement in the content domains and cognitive domains became lower. Students’ ability to learn will decrease as a result of teasing and bullying. This will lead to lower student engagement in school, which might decrease students’ desire to learn and perform well academically [
35]. Furthermore, students who had been bullied were exposed to aggressive behavior that leads to lower performance in mathematics and science [
72].
The findings of the SEM analysis indicated that when the students liked learning mathematics, their achievement in the content and cognitive domains became lower. For science, ‘liked learning science’ had a positive association with the content domains and cognitive domains.
It was difficult to explain the negative association between “liking learning mathematics” and student results, as well as in the content and cognitive domains. One possible explanation might be related to Ni et al.’s [
73] indication that the desire to learn mathematics could be improved through high-cognitive-domain tasks, and building a positive relationship with the mathematics classroom. Furthermore, Slavin [
74] stated that student motivation is influenced by previous experience in the school. High-achieving students might not be provided with high-cognitive-domain tasks that could make them like learning mathematics and have a positive relationship with the mathematics classroom. This might result in having a poor experience in mathematics lessons, and could affect their motivation negatively [
75,
76,
77]. However, the negative association must be interpreted with caution because it had the lowest coefficient value in the multiple linear regression model, which was significant at the
p = 0.05 level, while most of the other factors were significant at the
p = 0.001.
Studies in the literature showed similar findings to the current study of the positive association between science motivation and student achievement, and in the content and cognitive domain. Liou [
25], in a study of science motivational beliefs based on TIMSS data, concluded that there was a positive association between student motivational beliefs and academic performance.
The finding of the study indicated that when the students had a high level of engagement in mathematics lessons, their achievement in the content domains and cognitive domains became higher. For science, engaging teaching in science lessons had only one statistically significant negative effect with the latent variable ‘Reasoning’.
The positive association between classroom engagement, mathematics content and cognitive domains might be because students were actively involved in the learning activities of the mathematics lessons [
41]. When the students are actively involved in the learning activities, they will understand the mathematical concepts and will be able to respond to the question items that cover specific content and cognitive domains.
The last variable was confidence and self-concept in mathematics and science. The factor of confidence in learning mathematics and science had a positive association with students’ results, as well as in the content and cognitive domains. The most interesting finding was that the factor of confidence in learning mathematics and science was the strongest student factor, as it had the highest coefficient in the regression model. This finding is similar to that of Miscevic-Kadijevic [
52], who illustrated in an analysis study of TIMSS 2011 grade 4 results that cognitive achievement in the areas of Knowing, Applying and Reasoning was linked to self-confidence. Furthermore, in a study on Taiwan’s TIMSS 2011, Liou [
32] concluded that self-concept is positively associated with grade 4 students’ individual achievement in mathematics and science.
Based on the findings of the study, there were some implications that need to be addressed in order to improve student performance. The current study concluded that bullying had a negative association with student achievement. Bullying had a negative influence on student wellbeing and safety [
38], which could affect students’ desire to learn and perform well in schools. Therefore, schools need to establish a strong discipline system that includes proper consequences for students’ inappropriate behavior. Anderson, Ritter and Zamarro [
78] stated that schools should develop prevention approaches rather than waiting for students to be involved in discipline issues. The prevention program could include lectures, assembly programs, workshops and competitions to raise awareness. Furthermore, teacher classroom management programs help to reduce behavioral problems and improve students’ social competencies [
79].
As the study concluded that having breakfast on a school day had a positive association with grade 4 performance, it is important to ensure that students do not miss this important meal during school days. It is recommended to provide this meal to students at school in order to make sure that the students eat healthy food regularly. Au et al. [
13] stated that students who eat school breakfast and lunch receive a higher quality of diet than the ones who obtain their meals from home.
As the strongest student factor that was associated with academic achievement was students’ self-confidence, it is important to maintain high self-confidence for students. School leaders should ensure that their students maintain high levels of self-confidence by following up with the classroom strategies that enhance this. These classroom practices include having a well-structured learning environment that helps students to feel confident enough to achieve their teachers’ expectations [
80]. Teachers’ practices, experiences, and beliefs of learning and teaching related to TIMSS [
80,
81,
82] and their needs to help the students achieve well in TIMSS content and cognitive domains need to be considered very well and comprehensively, in line with the development of the science and mathematics curricula [
83,
84]. The culture context of the students and teachers also need to be considered when thinking about changes and improvements in the learning environment [
85].