Table 1. Factors Associated With Meeting vs Exceeding Preschooler Screen Time Guidelines.

Characteristic	No. (%)
No. of children in home, mean (SD)
Age 2 y	1.60 (.69)
Age 3 y	2.01 (.79)
Year of data collection,a mean (SD)
Age 2 y	2.28 (.62)
Age 3 y	2.93 (.77)
Child sex
Girls	768 (48.2)
Boys	826 (51.8)
Single-parent household	99 (5.0)
Family income, CAD $b
<39 999	87 (6.7)
40 000-79 999	321 (24.63)
80 000-124 999	474 (36.38)
>125 000	421 (32.31)
Child sleepc
Age 2 y (trouble sleeping)	446 (27.96)
Child meets physical activity guidelinesd
Age 2 y (>3 h per d)	1067 (66.9)
Age 3 y (>3 h per d)	679 (55.5)
Childcaree
Age 2 y	575 (36.1)
Age 3 y	698 (35.0)
Maternal high screen viewingf
Age 2 y (h per wk)	184 (11.5)
Age 3 y (h per wk)	209 (10.5)
Child exceeds screen time guidelinesg
Age 2 y	1266 (79.4)
Age 3 y	1889 (94.7)

^aTo control for a potential time trend on account of the rapid rise in technology over the course of data collection, the year in which the family completed the questionnaires was dummy coded as 1 = 2011, 2 = 2012, 3 = 2013, and 4 = 2014.

^bTo convert to USD $: 39 999 to 30 799; 40 000 to 30 800; 79 999 to 61 599; 80 000 to 61 600; 124 999 to 96 249; and 125 000 to 96 250.

^cAt age 2 years, child sleep was measured using a question from the Brief Infant-Toddler Social and Emotional Assessment about whether the child had trouble falling or staying asleep in the last month (1 = not true/rarely, 2 = somewhat true/sometimes, 3 = very true/often).

^dMaternal reports of the number of hours the child engaged in physical activity (eg, playing, walking, running, jumping, climbing, or dancing) on weekdays were obtained. Children were categorized as 0 equals not meeting 3 hours per day of physical activity or 1 equals meeting guidelines of 3 hours or more of physical activity per day based on World Health Organization guidelines.³

^eMaternal reports of whether the child attended nonparental day care or childcare (0 = childcare/day care, 1 = care by mother, relative, or nanny).

^fMothers self-reported on how their screen time exposure (ie, watching television) on a typical weekday and a weekly score was calculated. Mothers were dichotomized using a median split, which was either fewer than 14 hours per week or more than 14 hours per week.

^gMaternal reports of screen time were defined as time spent using particular electronic media (eg, computer, gaming systems, or devices) on a typical weekday and weekend day. A weighted weekly average was computed and children were classified as meeting (≤7 hours per week) vs not meeting (<7 hours) pediatric guidelines.