Table 2.

Regression analysis examining the relationship between active social media at the ages of 12-13 years and mental health at the ages of 14-15 years.

Model			Unadjusted model (N=2945)					Adjusted model (N=2603)
			Coefficient (95% CI)		P value		Coefficient (95% CI)			P value
Mental health—SDQa at ages 14-15 years
	Active social media at ages 12-13 years	0.96 (0.22 to 1.70)		.01		0.21 (−0.43 to 0.84)			.52
	Covariates	N/Ab		N/A		N/A			N/A
	SDQ at ages 12-13 years	N/A		N/A		0.53 (0.39 to 0.68)			<.001
Gender
	Male	N/A		N/A		−1.12			.14
	Female (reference)	N/A		N/A		N/A			N/A
Year participated in survey at ages 12-13 years			N/A		N/A		0.34 (0.17 to 0.50)			<.001
Ethnicity
	Black African or Caribbean	N/A		N/A		−3.33 (−6.09 to −0.57)			.02
	Asian	N/A		N/A		−0.28 (−2.25 to 1.69)			.78
	Mixed	N/A		N/A		−0.28 (−3.24 to 2.68)			.85
	Other	N/A		N/A		0.61 (−7.09 to 8.31)			.87
	White (reference)	N/A		N/A		N/A			N/A
Mother's highest qualification at ages 12-13 years
	GCSEc or equivalent	N/A		N/A		0.48 (−1.7 to 2.69)			.67
	A/ASd-level or equivalent	N/A		N/A		2.01 (−1.01 to 5.03)			.19
	Other higher qualification	N/A		N/A		−1.16 (−3.38 to 1.06)			.31
	Degree	N/A		N/A		−0.77 (−2.90 to 1.37)			.48
	No qualifications (reference)	N/A		N/A		N/A			N/A
Mother's marital status at ages 12-13 years
	Partnered	N/A		N/A		−1.09 (−3.29 to 1.11)			.33
	Nonpartnered (reference)	N/A		N/A		N/A			N/A
Number of employed people in household at ages 12-13 years			N/A		N/A		−0.51 (−1.79 to 0.77)			.44
Household income at ages 12-13 years			N/A		N/A		0.00 (−0.00 to 0.00)			.57

^aSDQ: Strengths and Difficulties Questionnaire.

^bN/A: not applicable.

^cGCSE: General Certificate of Secondary Education.

^dA/AS: advanced/advanced subsidiary.