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Table 1 Characteristics of study population in 1987 and 2006

From: Effect modification of social-context changes on mental disability in China from 1987 to 2006: a multi-level study of 1.9 million people

  Total Male Female
Unweight Weighted Unweight Weighted Unweight Weighted
Individual-level variables
1987
 Sample size 1,398,055 94,6282,249 702,759 475,941,433 695,296 47,0340,816
 Age, mean 31.4 31.4 (31.3-31.5) 31.1 31.1 (31.0-31.2) 31.7 31.7 (31.6-31.8)
 Residence, %
  Urban 29.4 28.8 (27.2-30.3) 29.1 28.4 (26.9-29.9) 29.8 29.1 (27.6-30.7)
  Rural 70.6 71.2 (69.7-72.8) 70.9 71.6 (70.1-73.1) 70.2 70.8 (69.3-72.4)
 Ethnicity, %
  Han 91.0 91.5 (90.8-92.3) 91.0 91.6 (90.8-92.3) 90.9 91.5 (90.8-92.3)
  Others 9.1 8.5 (7.7-9.2) 9.0 8.4 (7.7-9.2) 9.1 8.5 (7.7-9.2)
 Education, %
  Junior high school and above 31.6 31.0 (30.5-31.6) 38.0 37.6 (37.1-38.1) 25.0 24.4 (23.8-24.9)
  Primary school 39.0 39.4 (39.0-39.7) 42.7 43.2 (42.8-43.5) 35.2 35.5 (35.2-35.9)
  Never attended school 29.4 29.6 (29.1-30.0) 19.3 19.2 (18.8-19.6) 39.8 40.1 (39.5-40.7)
 Marital status, %
  Married 53.3 53.2 (53.0-53.4) 51.7 51.5 (51.3-51.7) 55.0 54.8 (54.7-55.0)
  Divorced or widowed 5.8 5.8 (5.7-5.9) 4.0 4.0 (3.9-4.1) 7.6 7.6 (7.5-7.7)
  Never married 40.9 41.0 (40.8-41.2) 44.3 44.5 (44.3-44.7) 37.4 37.5 (37.3-37.7)
 Household size
  1–3 19.8 19.7 (19.4-20.1) 20.4 20.4 (20.0-20.7) 19.2 19.1 (18.7-19.5)
  4–6 61.0 61.3 (61.0-61.6) 61.3 61.6 (61.2-61.9) 60.7 61.0 (60.7-61.3)
  7–9 19.2 19.0 (18.6-19.4) 18.3 18.1 (17.6-18.5) 20.1 19.9 (19.5-20.4)
 Living arrangement
  Living with others 98.7 98.6 (78.6-79.2) 98.4 98.4 (98.3-98.4) 98.9 98.9 (98.9-99.0)
  Living alone 1.3 1.4 (1.3-1.4) 1.6 1.6 (1.5-1.7) 1.1 1.1 (1.0-1.1)
 Currently employed, %
  Yes 78.8 78.9 (78.6-79.2) 86.7 86.8 (86.6-86.9) 70.8 70.9 (70.4-71.5)
  No 21.2 21.1 (20.8-21.4) 13.3 13.2 (13.1-13.4) 29.2 29.0 (28.5-29.6)
2006
 Sample 2,526,134 1,309,468,507 1,280,006 664,280,796 1,246,128 645,187,711
 Age, mean 35.8 35.7 (35.6-35.8) 35.2 35.1 (35.0-35.2) 36.5 36.4 (36.3-36.5)
 Residence, %
  Urban 33.9 30.8 (29.6-31.9) 32.8 30.1 (28.9-31.2) 34.3 31.4 (30.3-32.6)
  Rural 66.1 69.2 (68.1-70.4) 67.2 69.9 (68.8-71.1) 65.7 68.6 (67.4-69.7)
 Ethnicity, %
  Han 88.2 90.1 (89.5-90.7) 88.2 90.1 (89.4-90.7) 88.2 90.1 (89.5-90.7)
  Others 11.8 9.9 (9.3-10.5) 11.8 9.9 (9.3-10.6) 11.8 9.9 (9.3-10.5)
 Education, %
  Junior high school and above 49.8 48.8 (48.3-49.2) 54.9 54.1 (53.7-54.5) 44.5 43.3 (42.8-43.7)
  Primary school 31.1 31.7 (31.5-32.0) 31.3 31.9 (31.5-32.2) 30.9 31.6 (31.3-31.9)
  Never attended school 19.2 19.5 (19.3-19.7) 13.8 14.0 (12.8-14.2) 24.6 25.1 (24.8-25.5)
 Marital status, %
  Married 60.3 60.2 (60.3-60.4) 58.8 58.6 (58.4-58.8) 61.9 61.9 (61.7-62.1)
  Divorced or widowed 6.3 6.2 (6.2-6.3) 4.1 4.1 (4.1-4.2) 8.5 8.4 (8.3-8.5)
  Never married 33.4 33.6 (33.4-33.7) 37.1 37.3 (37.1-37.5) 29.7 29.7 (29.5-29.9)
 Household size
  1–3 44.5 43.4 (42.9-43.9) 45.4 44.4 (43.9-44.9) 43.5 42.4 (41.9-42.9)
  4–6 50.7 51.8 (51.4-52.3) 49.9 51.0 (50.6-51.5) 51.4 52.7 (52.2-53.1)
  7–9 4.9 4.7 (4.6-4.9) 4.7 4.6 (4.4-4.7) 5.1 4.9 (4.8-5.1)
 Living arrangement
  Living with others 97.5 97.5 (97.4-97.6) 97.4 97.4 (97.4-97.5) 97.6 97.7 (97.6-97.7)
  Living alone 2.5 2.5 (2.4-2.5) 2.6 2.7 (2.5-2.6) 2.4 2.3 (2.2-2.4)
 Currently employed, %
  Yes 55.3 56.1 (55.9-56.4) 59.8 60.2 (60.0-60.4) 50.8 51.9 (51.6-52.3)
  No 44.7 43.9 (43.6-44.1) 40.2 39.8 (39.6-40.0) 49.2 48.1 (47.7-48.4)
Province-level variables 1987 2006
Median Interquartile range   Median Interquartile range
Per capita gross domestic product (yuan) 756 641-1098   13313 10798-21788
Number of health professional in per 1,000 people 3.4 2.8-4.7   3.7 3.0-4.5
Proportion of agriculture, forestry, animal husbandry and fishery (%) 77 62.5-80.2   1.9 1.1-5.3
Illiterate (%) 26.2 20.5-30.7   9.2 5.2-11.3
Percentage of aged 65 and older (%) 5.5 5.0-6.0   9 8.1-10.6