Table 1

Baseline and two follow-up surveys sample size and participants’ characteristics
Baseline 7-month 20-month
interviewed no p interviewed no p
Sample 4079 2220 1859 1888 2191
City, No. (%) lanzhou 2961 (72.6) 1603 (72.2) 1358 (73.1) .55 1572 (71.7) 1389 (73.6) .19
baiyin 1118 (27.4) 617 (27.8) 501 (26.9) 619 (28.3) 499 (26.4)
sex, No. (%) Male 1919 (47.0) 1076 (48.5) 843 (45.3) .05 1027 (54.4) 892 (40.7) <.001
Female 2160 (53.0) 1144 (51.5) 1016 (54.7) 861 (45.6) 1299 (59.3)
age, No. (%) 16-35 777 (19.0) 326 (14.7) 451 (24.3) <.001 517 (23.6) 260 (13.8) <.001
36-45 1220 (29.9) 655 (29.5) 565 (30.4) 664 (30.3) 556 (29.4)
46-55 1048 (25.7) 617 (27.8) 431 (23.2) 525 (24.0) 523 (27.7)
56-65 674 (16.5) 388 (17.5) 286 (15.4) 324 (14.8) 350 (18.5)
> = 66 360 (8.8) 234 (10.5) 126 (6.8) 161 (7.3) 199 (10.5)
Ethnicity, No. (%) Han 3848 (94.3) 2107 (94.9) 1741 (93.7) .08 1774 (94.0) 2074 (94.7) 0.34
Minority 231 (5.7) 113 (5.1) 118 (6.3) 114 (6.0) 117 (5.3)
education, No. (%) primary or less 759 (18.6) 444 (20.0) 315 (16.9) .001 362 (19.2) 397 (18.1) 0.25
Junior high school 1482 (36.3) 825 (37.2) 657 (35.3) 705 (37.3) 777 (35.5)
High school 1384 (33.9) 735 (33.1) 649 (34.9) 625 (33.1) 759 (34.6)
College or above 454 (11.1) 216 (9.7) 238 (12.8) 196 (10.4) 258 (11.8)
Dibao, No. (%) yes 3283 (80.5) 821 (37.0) 559 (30.1) <.001 691 (36.6) 689 (31.4) <.001
no 537 (13.2) 1399 (63.0) 1300 (69.9) 1197 (63.4) 1502 (68.6)
marriage, No. (%) Married 257 (6.3) 1741 (78.5) 1542 (83.0) 1460 (77.4) 1823 (83.2) <.001
Divorced 1286 (31.5) 407 (18.3) 130 (7.0) .001 374 (19.8) 163 (7.4)
Never-married 1458 (35.7) 71 (3.2) 186 (10.0) 53 (2.8) 204 (9.3)
employment, No. (%) retired 1335 (32.7) 750 (33.8) 536 (28.8) <.001 645 (29.4) 641 (34.0) <0.01
unemployed 1380 (33.8) 789 (35.5) 669 (36.0) 802 (36.6) 656 (34.7)
employed 2699 (66.2) 681 (30.7) 654 (35.2) 744 (34.0) 591 (31.3)
health insurance, No. (%) no 2445 (59.9) 1331 (60.0) 1114 (59.9) .98 1081 (57.3) 1364 (62.3) .001
yes 1634 (40.1) 889 (40.0) 745 (40.1) 807 (42.7) 827 (37.7)
CES-D Baseline, No. (%) <16 1742 (42.7) 917 (41.3) 825 (44.4) .08 974 (44.5) 768 (40.7) .06
16-20 766 (18.8) 416 (18.7) 350 (18.8) 405 (18.5) 361 (19.1)
21-25 684 (16.8) 373 (16.8) 311 (16.7) 364 (16.6) 320 (16.9)
≥26 887 (21.7) 514 (23.2) 373 (20.1) 448 (20.4) 439 (23.3)

Tian et al.

Tian et al. BMC Psychiatry 2012 12:151   doi:10.1186/1471-244X-12-151

Open Data