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Table 1 Characteristics of the study sample by age

From: Describing objectively measured physical activity levels, patterns, and correlates in a cross sectional sample of infants and toddlers from South Africa

  3mo (n = 32) 6mo (n = 31) 12mo (n = 31) 18mo (n = 18) 24mo (n = 28)
Infant sex (% boys)a 14 (44) 21 (68) 15 (48) 10 (56) 14 (50)
Infant weight (kg)b 5.8 (0.8) 7.7 (1.2) 9.0 (1.0) 9.9 (1.5) 10.8 (1.2)
Infant length (cm)b 58.7 (5.1) 65.0 (2.7) 72.9 (3.6) 79.3 (4.3) 82.3 (3.9)
Infant BMI z scoreb 0.2(2.5) 0.6 (1.6) 0.3 (1.3) −0.3 (1.6) 0.2 (1.0)
Attainment of milestones at given agea
Holding head 21 (66) NA NA NA NA
Rolling NA 13 (42) NA NA NA
Sitting NA 16 (52) NA NA NA
Crawling NA 7 (23) 16 (52) NA NA
Pulling up NA NA 14 (45) NA NA
Walking NA NA 9 (29) 6 (33) 28 (100)
Running NA NA NA 4 (22) NA
Maternal BMI (kg/m2)b 28.5 (9.1) 27.8 (6.7) 29.5 (7.0) 27.5 (8.0) 27.3 (6.7)
Maternal age (years)b 27 (5) 31 (6) 29 (5) 32 (6) 29 (7)
Infant PA (mg)c 23 (17–28) 30 (24–34) 36 (30–39) 39 (35–45) 44 (37–51)
Home Environment (score/48)b 24 (8) 20 (4) 21 (5) 24 (5) NA
Maternal Beliefs (score/4)a
PA Knowledge NA 1.4 (0.3) 1.4 (0.3) NA NA
PA views NA 1.7 (0.5) 1.9 (0.6) NA NA
Negative PA views NA 3.0 (0.5) 2.8 (0.6) NA NA
PA optimism NA 1.4 (0.4) 1.5 (0.5) NA NA
Future expectations NA 2.5 (0.8) 2.6 (0.7) NA NA
Floor play concerns NA 3.0 (0.8) 3.0 (0.6) NA NA
Self efficacy NA 1.4 (0.3) 1.5 (0.4) NA NA
  1. BMI - body mass index, PA - physical activity. At 24-months, all toddlers were assumed to be walking although not specifically reported at this time-point
  2. NA Indicates that data was not acquired at the specific age
  3. an(%)
  4. bAll data are presented as mean(SD)
  5. cor median(IQR)