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Table 1 Characteristics of the sample at the three time points

From: Longitudinal changes in objectively measured physical activity differ for weekdays and weekends among Chinese children in Hong Kong

  Baseline 1-yr follow-up 2-yr follow-up ≥2 time pointsa
N consented to wear ActiGraph/distributed 1023/448 874/874 706/706 NA
N with returned ActiGraph 445 852 693 NA
N with ≥3 days of PA data including 1 weekend day (% of distributed sample) 263 (58.7) 537 (61.4) 421 (59.6) 412
Age (yrs) 7.8 (1.0) 8.6 (1.0) 9.5 (1.0) 7.6 (1.0)
Gender (% boys) 52.6 52.8 54.8 54.0
BMI (kgm−2) 17.3 (3.1) 17.7 (3.3) 18.2 (3.5) 17.1 (3.0)
Overweight and obese (%) 25.8 24.6 26.2 24.1
Parental education level 4.3 (1.4) 4.5 (1.5) 4.5 (1.5) 4.5 (1.5)
Having sibling (%) 62.7 64.9 65.2 66.1
Marital status (% single parent) 12.9 10.4 10.4 8.8
Wearing time (mind−1) 789 (90) 796 (78) 801 (90) 793 (86)
MVPA (mind−1) 61.5 (23.3) 50.0 (20.4) 45.6 (20.7) 64.2 (22.7)
LPA (mind−1) 323.2 (67.3) 329.6 (62.4) 314.8 (64.4) 326.5 (65.8)
ST (mind−1) 402.1 (73.2) 414.7 (72.3) 439.8 (80.1) 402.9 (72.5)
% MVPA 8.2 (3.1) 6.4 (2.6) 5.9 (2.8) 8.4 (3.0)
% LPA 40.8 (6.6) 41.0 (6.4) 38.8 (6.9) 40.8 (6.5)
% ST 51.0 (8.1) 52.5 (7.6) 55.2 (8.3) 50.7 (7.9)
  1. Values are means (SD) unless otherwise specified; MVPA moderate-to-vigorous physical activity; LPA, light-intensity physical activity; ST sedentary time; BMI body mass index
  2. aFor those who provided valid accelerometer data for at least two time points (N = 412), baseline data are presented