. 2019 Dec 29;17(1):243. doi: 10.3390/ijerph17010243

Table 4.

Correlations between lifestyle habits with academic performance measures at baseline in high school female and male students.

	Female students				Male students
	OA	SCI	MAT	LAN	OA	SCI	MAT	LAN
Studying time	0.00	−0.10	−0.02	−0.01	0.29 *	0.09	0.18	0.28 ^†
Physical activity	0.00	−0.12	−0.05	0.10	0.08	0.07	0.09	−0.05
Number of meals/day	0.11	0.11	0.15	0.17	−0.21 ^§	0.01	−0.25 ^§	−0.15 ^§
Serving of fruits and vegetables/day	0.06	−0.06	0.08	0.03	0.25	0.13	0.24	0.17
Screen usage
Television WD	−0.34 **	−0.19	−0.36 **	−0.37 **	−0.01 ^§	−0.09	−0.04 ^§	0.01 ^§
Television WE	−0.33 **	−0.16	−0.32 **	−0.29 *	−0.10	−0.10	−0.15	−0.13
Computer WD	−0.17	−0.01	−0.14	−0.25 *	−0.01	−0.10	0.04	0.01
Computer WE	0.07	0.08	0.04	0.06	0.16	0.13	0.20	0.03
Video games WD	−0.17	−0.17	−0.16	−0.23 ^†	−0.04	−0.15	0.02	−0.08
Video games WE	−0.19	−0.05	−0.22 ^†	−0.25 *	−0.31 *	−0.27 ^†	−0.32 *	−0.17
Cellphone WD	−0.26 *	−0.29 *	−0.35 **	−0.36 **	0.22 ^§	0.07 ^§	0.20 ^§	0.09 ^§
Cellphone WE	−0.33 **	−0.25 *	−0.39 **	−0.42 **	0.25 ^§	0.24 ^§	0.14 ^§	0.16 ^§
Social media WD	−0.02	0.03	−0.03	−0.17	0.00	−0.09	0.03	−0.02
Social media WE	−0.24 *	−0.19	−0.21	−0.37 **	0.03	0.03	0.00	−0.03 ^§
Sleep habits
Bedtime WD	0.11	0.23 ^†	0.01	0.22	−0.08	−0.05	−0.11	−0.19 ^§
Bedtime WE	−0.26 *	−0.17	−0.25 *	−0.30 *	−0.08	0.04	−0.12	−0.04 ^§
Wake up time WD	0.11	0.09	0.05	0.10	0.06	0.10	0.12	0.01
Wake up time WE	0.06	0.11	0.00	−0.01	−0.03	−0.12	−0.17	0.03
Sleep duration WD	−0.05	−0.18	0.01	0.04	0.11	0.10	0.17	0.20
Sleep duration WE	0.28 *	0.26 *	0.20	0.23 ^†	0.04	−0.15 ^§	−0.06	0.07
Sleep onset latency	−0.22 ^†	−0.12	−0.26 *	−0.22 ^†	−0.22	−0.16	−0.26 ^†	−0.24

^† Tendency (0.05 < p < 0.08), * p < 0.05, ** p < 0.01. ^§ Significantly different from female students (p < 0.05). OA: Overall average, SCI: Science, MAT: Mathematics, LAN: Language, WD: Weekdays, WE: Weekend. Control variables: Age, pubertal status, socioeconomic status, and ethnicity.