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Table 1 Median sample characteristics over time according to sex, China Health and Nutrition Survey 1991-2009a

From: Differential associations of urbanicity and income with physical activity in adults in urbanizing China: findings from the population-based China Health and Nutrition Survey 1991-2009

  Men Women
  1991 2000 2009 1991 2000 2009
N 4041 4410 4469 4382 4730 4768
Age, years 38.3 43.6 48.2 38.0 43.7 48.9
(28.0, 51.3) (32.3, 54.1) (38.2, 58.8) (28.1, 50.8) (33.3, 53.9) (38.9, 59.0)
Income, 1000 Yuanb 8.6 10.4 19.5 8.6 10.3 17.9
(13.0, 19.7) (18.7, 29.9) (34.9, 58.8) (13.0, 19.5) (18.5, 30.0) (33.0, 56.7)
Urbanicityc 32.1 43.0 50.8 32.3 43.5 51.1
(44.5, 61.0) (55.8, 76.8) (64.2, 85.1) (44.9, 61.0) (57.4, 76.9) (65.6, 85.4)
Total PAd       
  MET-hours/week 336.0 239.9 160.0 401.7 243.9 143.2
(168.0, 576.0) (106.0, 385.5) (73.0, 301.5) (192.0, 651.1) (94.0, 420.5) (61.7, 304.4)
  Hours/week 70.0 56.0 50.5 89.3 61.6 51.2
(51.0, 102.0) (40.7, 83.3) (21.0, 77.8) (62.0, 125.5) (35.8, 92.7) (23.3, 80.0)
Occupational PAd       
  MET-hours/week 304.0 224.0 138.0 330.0 204.0 80.0
(132.0, 558.0) (80.0, 366.0) (36.0, 280.0) (106.0, 582.0) (42.0, 366.0) (0.0, 240.0)
  Hours/week 60.0 54.0 49.0 60.0 48.5 40.0
(48.0, 96.0) (40.0, 82.0) (39.0, 80.0) (48.0, 98.0) (37.0, 77.0) (8.0, 63.0)
Domestic PAd       
  MET-hours/week 1.7 0.0 2.8 49.7 32.0 38.1
(0.0, 19.3) (0.0, 13.1) (0.0, 18.7) (23.6, 78.9) (15.8, 48.8) (22.4, 58.3)
  Hours/week 1.0 0.0 1.2 21.0 14.0 16.3
(0.0, 8.2) (0.0, 5.8) (0,0, 8.2) (10.3, 32.8) (7.0, 21.0) (9.3, 24.5)
Leisure PAd       
  MET-hours/week -- 0.0 0.0 -- 0.0 0.0
(0.0, 0.0) (0.0, 0.0)   (0.0, 0.0) (0.0, 0.0)
  Hours/week -- 0.0 0.0 -- 0.0 0.0
(0.0, 0.0) (0.0, 0.0)   (0.0, 0.0) (0.0, 0.0)
Travel PAd       
  MET-hours/week -- 5.0 0.0 -- 4.7 0.0
(0.0, 12.5) (0.0, 5.0)   (0.0, 10.8) (0.0, 5.0)
  Hours/week -- 2.5 0.8 -- 2.5 1.7
(1.3, 5.0) (0.0, 2.5) (1.3, 5.0) (0.0, 2.5)
  1. aAll cells are shown as median (25th percentile, 75th percentile). Kruskal-Wallis tests for difference in median values over time were statistically significant at the p < 0.05 level for all characteristics in men and women
  2. bHousehold income derived inflated to 2009 Yuan values
  3. cUrbanicity defined by a multicomponent urbanicity scale with possible score of 0-120 points
  4. dPA values derived from self-reported questionnaires
  5. Abbreviations: PA physical activity