Table 4. Association between the purposes of Internet use and pubertal timing and weight status among female adolescents.

	Chatting		Gaming		Non-academic browsing		Pornography viewing
	N (%)	aOR (95% CI)	N (%)	aOR (95% CI)	N (%)	aOR (95% CI)	N (%)	aOR (95% CI)
Pubertal development
Early puberty	78 (49.1)	1.22 (0.86–1.76)	27 (17)	0.59 (0.36–0.96)	94 (59.1)	1.07 (0.74–1.53)	2 (1.3)	NA
On-time puberty	378 (43)	Reference	190 (21.6)	Reference	490 (55.7)	Reference	2 (0.2)	NA
Late puberty	63 (41.7)	0.90 (0.61–1.32)	39 (25.8)	1.06 (0.68–1.64)	77 (51.0)	0.78 (0.54–1.14)	0 (0)	NA
BMI at W1
Thin weight	67 (46.9)	1.34 (0.82–2.21)	33 (23.1)	0.54 (0.29–0.99)	77 (53.8)	0.82 (0.50–1.34)	0 (0)	NA
Normal weight	387 (43.4)	Reference	187 (21)	Reference	498 (55.8)	Reference	4 (0.4)	NA
Overweight	46 (44.2)	0.91 (0.50–1.65)	25 (24)	1.92 (0.96–3.83)	64 (61.5)	1.36 (0.75–2.49)	0 (0)	NA
Obesity	19 (38)	0.57 (0.19–1.65)	11 (22)	1.91 (0.52–1.94)	22 (44)	0.88 (0.31–2.54)	0 (0)	NA
BMI at W3
Thin weight	51 (42.5)	0.71 (0.43–1.20)	36 (30)	2.50 (1.39–4.48)	64 (53.3)	0.98 (0.59–1.64)	1 (0.8)	NA
Normal weight	402 (43.7)	Reference	189 (20.6)	Reference	514 (55.9)	Reference	2 (0.2)	NA
Overweight	43 (43.9)	1.07 (0.58–1.98)	19 (19.4)	0.56 (0.26–1.20)	60 (61.2)	1.03 (0.55–1.92)	1 (1)	NA
Obesity	23 (44.2)	1.35 (0.45–4.07)	12 (23.1)	0.47 (0.12–1.81)	23 (44.2)	0.52 (0.17–1.55)	0 (0)	NA
ΔBMI-SDS W1-3		0.96 (0.66–1.30)		1.27 (0.87–1.86)		1.26 (0.91–1.74)		NA

aOR represents adjusted odds ratio; CI, confidence interval; BMI-SDS, standardized score of body mass index; W1, Wave 1; W3, Wave 3; NA, not applicable. Family monthly income was adjusted in multivariate binary logistic regression analysis. Due to an insufficient number of pornography viewers, regression analysis was not applicable to the female population