TABLE 2.

Mean screen time according to device and mother/child characteristics during 2‐ and 4‐year follow‐up.

	Total screen time a	TV time	Total other screens b
	Mean (SD)	Mean (SD)	Mean (SD)
2 years	NA	149.5 (120.3)	NA
Sex		p = 0.94
Female	NA	149.7 (124.1)	NA
Male	NA	149.2 (116.7)	NA
Ethnicity		p = 0.58
Black	NA	147.7 (113.8)	NA
White	NA	147.7 (119.5)	NA
Brown	NA	157.0 (131.0)	NA
Family income		p = 0.07
≤ 1	NA	135.9 (113.5)	NA
1.1–3.0	NA	157.5 (130.7)	NA
3.1–6.0	NA	137.7 (106.9)	NA
6.1–10.0	NA	142.5 (111.2)	NA
> 10.0	NA	150.4 (90.8)	NA
Maternal education (years)		p = 0.31
0–4	NA	133.9 (131.4)	NA
5–8	NA	155.3 (131.1)	NA
9–11	NA	152.5 (120.4)	NA
≥ 12	NA	145.5 (107.7)	NA
4 years	266.1 (178.5)	171.9 (127.3)	129.9 (117.5)
Sex	p = 0.01	p = 0.02	p = 0.39
Female	258.5 (172.7)	167.2 (123.2)	128.1 (117.9)
Male	273.5 (183.8)	176.4 (130.9)	131.7 (117.2)
Ethnicity	p = 0.29	p = 0.45	p = 0.01
Black	266.8 (190.3)	172.0 (129.2)	139.4 (129.7)
White	264.3 (175.8)	170.8 (125.4)	126.5 (114.9)
Brown	276.3 (184.5)	177.9 (134.3)	141.2 (123.7)
Family income	p < 0.001	p < 0.001	p < 0.001
≤ 1	264.7 (185.0)	175.9 (133.2)	144.3 (125.5)
1.1–3.0	283.3 (188.3)	181.4 (135.6)	139.9 (127.6)
3.1–6.0	258.2 (172.0)	165.5 (122.6)	122.2 (103.9)
6.1–10.0	229.2 (147.3)	149.9 (99.0)	104.7 (94.7)
> 10.0	202.8 (114.7)	137.7 (83.2)	87.5 (68.1)
Maternal education (years)	p < 0.001	p < 0.001	p < 0.001
0–4	277.6 (219.6)	172.3 (148.5)	166.1 (150.6)
5–8	284.7 (188.1)	185.6 (136.9)	145.3 (128.4)
9–11	282.3 (178.2)	180.8 (131.1)	134.0 (118.1)
≥ 12	228.5 (149.7)	150.1 (103.0)	104.7 (91.5)

Note: Bolded p‐values are considered significant (< 0.05).

^a Total time: TV + Total other screens.

^b Total other screens: computer and videogames; NA: not available.