Table 1.
Comparison of major risk factors between cases and controls
| Factor | Control (n = 566) n (%) | Case (n = 316) n (%) | P value * |
|---|---|---|---|
| Age (yrs) | 1.6 | 1.7 | 0.01 |
| < 6 m | 125(22.1) | 49(15.5) | |
| 6-12 m | 93(16.4) | 60(19.0) | |
| 13-18 m | 97(17.1) | 50(15.8) | |
| 19-24 m | 75(13.3) | 51(16.1) | |
| 25-28 m& | 41(7.2) | 32(10.1) | |
| 29-48 m | 135(23.9) | 74(23.4) | 0.12 |
| Height (cm) | 75.9 | 79.5 | 0.10 |
| Weight (kg) | 11.0 | 11.3 | 0.25 |
| Sex | |||
| Male | 329(58.1) | 200(63.3) | |
| Female | 237(41.9) | 116(36.7) | 0.15 |
| Breastfeeding type | |||
| Mixed | 250(44.2) | 180(57.0) | |
| Exclusive breastfeeding | 316(55.8) | 136(43.0) | 0.004 |
| Went to see a doctor | |||
| No | 518(94.5) | 296(93.7) | |
| Yes | 30(5.5) | 20(6.3) | 0.74 |
| Went to visit a patient | |||
| No | 458(83.6) | 255(80.7) | |
| Yes | 90(16.4) | 61(19.3) | 0.33 |
| Hand-washing before dinner | |||
| Yes | 435(78.8) | 182(58.0) | |
| No | 117(21.2) | 132(42.0) | 0.001 |
| Hand-washing after toilet use | |||
| Yes | 375(70.0) | 182(58.7) | |
| No | 161(30.0) | 128(41.3) | 0.001 |
| Hand-washing before contacting child | |||
| No | 207(38.6) | 170(55.6) | |
| Yes | 329(61.4) | 136(44.4) | 0.001 |
| Went to indoor playground | |||
| No | 462(84.5) | 226(71.5) | |
| Yes | 85(15.5) | 90(28.4) | 0.001 |
| Went to outdoor playground | |||
| No | 441(80.6) | 206(65.2) | |
| Yes | 106(19.4) | 110(34.8) | 0.001 |
| House trash | |||
| No | 515(91.0) | 239(75.6) | |
| Yes | 51(9.0) | 77(24.4) | 0.001 |
| Monthly household income (RMB) | |||
| <10 k | 281(84.4) | 153(85.5) | |
| ≥10 k | 52(15.6) | 26(14.5) | 0.84 |
| House crowding (person/100 m2) | 6.3 | 6.9 | 0.14 |
*χ2 test for categorical variables and t test for continuous variables.