Table 2.
Descriptive statistics
| Characteristics | Sample | Outpatient | Inpatient | ||
|---|---|---|---|---|---|
| N (%)a | N (%)b | P | N (%)b | P | |
| Wave | < 0.001 | < 0.001 | |||
| 1991 | 9976(13.7) | 656(6.6) | 158(1.6) | ||
| 1993 | 9139(12.5) | 272(3.0) | 78(0.9) | ||
| 1997 | 9304(12.7) | 427(4.6) | 61(0.7) | ||
| 2000 | 9226(12.6) | 464(5.0) | 43(0.5) | ||
| 2004 | 8023(11.0) | 964(12.0) | 78(1.0) | ||
| 2006 | 7908(10.8) | 897(11.3) | 74(0.9) | ||
| 2009 | 8396(11.5) | 1011(12.0) | 106(1.3) | ||
| 2011 | 11,138(15.2) | 1602(14.4) | 186(1.7) | ||
| Region group | < 0.001 | < 0.001 | |||
| Urban | 11,777(16.1) | 1331(11.3) | 195(1.7) | ||
| Suburban | 12,919(17.7) | 1082(8.4) | 142(1.1) | ||
| Town | 11,734(16.1) | 941(8.0) | 155(1.3) | ||
| Rich village | 18,225(24.9) | 1376(7.6) | 134(0.7) | ||
| Poor village | 18,455(25.2) | 1563(8.5) | 158(0.9) | ||
| Income group | 0.002 | 0.111 | |||
| Quintile1 | 14,620(20.0) | 1268(8.7) | 176(1.2) | ||
| Quintile2 | 14,622(20.0) | 1210(8.3) | 167(1.1) | ||
| Quintile3 | 14,616(20.0) | 1204(8.2) | 163(1.1) | ||
| Quintile4 | 14,629(20.0) | 1237(8.5) | 142(1.0) | ||
| Quintile5 | 14,623(20.0) | 1374(9.4) | 136(0.9) | ||
| Age group | < 0.001 | < 0.001 | |||
| 0~ | 7015(9.6) | 210(3.0) | 27(0.4) | ||
| 16~ | 13,303(18.2) | 510(3.8) | 62(0.5) | ||
| 31~ | 20,597(28.2) | 1229(6.1) | 168(0.8) | ||
| 46~ | 19,374(26.5) | 2108(10.9) | 207(1.1) | ||
| 60~ | 12,821(17.5) | 2236(17.4) | 320(2.5) | ||
| Gender | < 0.001 | 0.741 | |||
| Male | 35,212(48.2) | 2704(7.7) | 373(1.1) | ||
| Female | 37,898(51.8) | 3589(9.5) | 411(1.1) | ||
| Marriage status | < 0.001 | < 0.001 | |||
| Never married | 14,697(20.1) | 477(3.3) | 62(0.4) | ||
| Married | 53,401(73.0) | 5037(9.4) | 615(1.2) | ||
| Others | 5012(6.9) | 779(15.5) | 107(2.1) | ||
| Education level | < 0.001 | < 0.001 | |||
| Below primary school | 19,829(27.1) | 2185(11.0) | 280(1.4) | ||
| Grad from primary | 15,950(21.8) | 1361(8.5) | 162(1.0) | ||
| Junior middle school | 21,723(29.7) | 1489(6.9) | 184(0.9) | ||
| Senior middle school or above | 15,608(21.4) | 1258(8.1) | 158(1.0) | ||
| Health insurance | < 0.001 | < 0.001 | |||
| Yes | 39,239(53.7) | 2433(6.2) | 248(0.6) | ||
| No | 33,871(46.3) | 3860(11.4) | 536(1.6) | ||
| BMI | < 0.001 | < 0.001 | |||
| Underweight | 10,385(14.2) | 701(6.8) | 78(0.8) | ||
| Normal weight | 51,797(70.85) | 4243(8.2) | 547(1.1) | ||
| Overweight | 9692(13.26) | 1153(11.9) | 142(1.5) | ||
| Obese | 1236(1.69) | 196(15.9) | 17(1.4) | ||
| Over all | 73,110(100.0) | 6293(8.6) | 784(1.1) | ||
aSample distribution among each character
bNumber and percentage of health care utilization