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Table 1 Baseline characteristics of survey participants

From: The association between ambient fine particulate air pollution and physical activity: a cohort study of university students living in Beijing

  Total Male Female p
N 3097 2070 1027  
Age (yr), mean (SD) 18.18 (.85) 18.22 (.89) 18.10 (.76) 0.000
Ethnicity, n (%)
 Han 2891 (90.43) 1953 (90.79) 938 (89.67) 0.313
 Minority 306 (9.57) 198 (9.21) 108 (10.33)
Body mass index, mean (SD)
 BMI (kg/m2) 21.21 (3.80) 21.82 (4.07) 19.98 (2.80) 0.000
Smoking, n (%)
 Current smoker 24 (0.78) 21 (1.01) 3 (0.30) 0.038
 Current nonsmoker 3056 (99.22) 2065 (98.99) 991 (99.70)
Drinking n (%)
 Current drinker 88 (2.86) 73 (3.50) 15 (1.51) 0.002
 Current nondrinker 2992 (97.14) 2013 (96.50) 979 (98.49)
Self-rated physical health, mean (SD)
 Physical health score (1–10) 5.78 (1.83) 5.77 (1.86) 5.80 (1.75) 0.687
Self-rated mental health, mean (SD)
 Mental health score (1–10) 7.07 (1.89) 7.09 (1.92) 7.02 (1.81) 0.339
Leisure-time vigorous physical activity, mean (SD)
 Total minutes of vigorous physical activity in last week 96.01 (112.52) 107.35 (115.65) 72.83 (102.04) 0.000
Leisure-time moderate physical activity, mean (SD)
 Total minutes of moderate physical activity in last week 212.12 (173.76) 219.63 (174.92) 197.52 (170.63) 0.001
Leisure-time MVPA, mean (SD)
 Total minutes of vigorous and moderate physical activity in last week 306.53 (228.99) 325.77 (231.13) 268.33 (219.89) 0.000
Walking, mean (SD)
 Total minutes of walking in last week 71.61 (115.84) 71.49 (110.14) 71.85 (126.42) 0.939
Sedentary behavior, mean (SD)
 Total hours of sedentary behavior per day 8.96 (2.78) 8.87 (2.80) 9.12 (2.75) 0.019
Sleeping behavior, mean (SD)
 Total hours of sleeping behavior per day 7.68 (0.85) 7.69 (0.84) 7.65 (0.87) 0.228
Total MTEs in last week, mean (SD) 1732.45 (1372.42) 1843.00 (1371.02) 1510.93 (1348.88) 0.000