Table 1 The characteristics of CHNS from 1989 to 2011
Characteristics | 1989 | 1991 | 1993 | 1997 | 2000 | 2004 | 2006 | 2009 | 2011 |
|---|---|---|---|---|---|---|---|---|---|
N | 5080 | 8382 | 8017 | 8473 | 9374 | 9100 | 9039 | 9426 | 12,543 |
Age | |||||||||
 18–39 | 4206(82.80) | 4395(52.43) | 3945(49.21) | 3689(43.54) | 3773(40.25) | 2890(31.76) | 2555(28.27) | 2425(25.73) | 2957(23.57) |
 40–59 | 866(17.05) | 2718(32.43) | 2786(34.75) | 3245(38.30) | 3807(40.61) | 4125(45.33) | 4221(46.70) | 4391(46.58) | 5896(47.01) |
 60–100 | 8(0.16) | 1269(15.14) | 1286(16.04) | 1539(18.16) | 1794(19.14) | 2085(22.91) | 2263(25.04) | 2610(27.69) | 3690(29.42) |
Sex | |||||||||
 Males | 2401(47.26) | 4052(48.34) | 3867(48.24) | 4171(49.23) | 4520(48.22) | 4348(47.78) | 4255(47.07) | 4485(47.58) | 5890(46.96) |
 Females | 2679(52.74) | 4330(51.66) | 4150(51.76) | 4302(50.77) | 4854(51.78) | 4752(52.22) | 4784(52.93) | 4941(52.42) | 6653(53.04) |