Table 4.
Distribution of etiological factors in affected and unaffected children.
| Etiological factors | MIH+ |
MIH− |
Total |
χ2 | p values | ||||
|---|---|---|---|---|---|---|---|---|---|
| n | (%) | n | (%) | n | (%) | ||||
| Complications during pregnancy | Yes | 13 | (26.0) | 37 | (74.0) | 50 | (100) | 5.87 | 0.015a |
| No | 202 | (13.8) | 1259 | (86.2) | 1461 | (100) | |||
| Birth prematurity | Yes | 16 | (29.6) | 38 | (70.4) | 54 | (100) | 10.88 | 0.001a |
| No | 199 | (13.7) | 1258 | (86.3) | 1457 | (100) | |||
| Birth Weight | <1500 g | 4 | (14.8) | 23 | (85.2) | 27 | (100) | 0.369 | 0.832 |
| 1500–2500 g | 75 | (13.5) | 480 | (86.5) | 555 | (100) | |||
| >2500 g | 136 | (14.6) | 793 | (85.4) | 929 | (100) | |||
| Average breast feeding period | None | 25 | (25.5) | 73 | (74.5) | 98 | (100) | 11.282 | 0.004a |
| <12 months | 114 | (13.0) | 762 | (87.0) | 876 | (100) | |||
| ≥12 months | 76 | (14.2) | 461 | (85.8) | 537 | (100) | |||
| Diarrhea frequency | Yes | 37 | (33.3) | 74 | (66.7) | 111 | (100) | 35.827 | <0.001a |
| No | 178 | (12.7) | 1222 | (87.3) | 1400 | (100) | |||
| Digestive system diseases | Yes | 30 | (46.9) | 34 | (53.1) | 64 | (100) | 58.361 | <0.001a |
| No | 185 | (12.8) | 1262 | (87.2) | 1447 | (100) | |||
| Asthma | Yes | 22 | (30.6) | 50 | (69.4) | 72 | (100) | 16.512 | <0.001a |
| No | 193 | (13.4) | 1246 | (86.6) | 1439 | (100) | |||
| Pneumonia | Yes | 28 | (18.1) | 127 | (81.9) | 155 | (100) | 2.082 | 0.149 |
| No | 187 | (13.8) | 1169 | (86.2) | 1356 | (100) | |||
| Lower respiratory tract diseases | Yes | 52 | (12.5) | 363 | (87.5) | 415 | (100) | 1.353 | 0.245 |
| No | 163 | (14.9) | 933 | (85.1) | 1096 | (100) | |||
| Throat infections | Yes | 83 | (15.2) | 463 | (84.8) | 546 | (100) | 0.662 | 0.416 |
| No | 132 | (13.7) | 833 | (86.3) | 965 | (100) | |||
| Frequent high fever | Yes | 33 | (20.6) | 127 | (79.4) | 160 | (100) | 5.998 | 0.014a |
| No | 182 | (13.5) | 1169 | (86.5) | 1351 | (100) | |||
| Ear infection | Yes | 32 | (20.9) | 121 | (79.1) | 153 | (100) | 6.236 | 0.013a |
| No | 183 | (13.5) | 1175 | (86.5) | 1358 | (100) | |||
| Renal failure | Yes | 27 | (39.7) | 41 | (60.3) | 68 | (100) | 37.869 | ≤0.001a |
| No | 188 | (13.0) | 1255 | (87.0) | 1443 | (100) | |||
| Urinary tract infection | Yes | 30 | (18.2) | 135 | (81.8) | 165 | (100) | 2.371 | 0.124 |
| No | 185 | (13.7) | 1161 | (86.3) | 1346 | (100) | |||
| Rubeola | Yes | 28 | (45.9) | 33 | (54.1) | 61 | (100) | 52.249 | ≤0.001a |
| No | 187 | (12.9) | 1263 | (87.1) | 1450 | (100) | |||
| Chickenpox | Yes | 97 | (31.6) | 210 | (68.4) | 307 | (100) | 95.217 | ≤0.001a |
| No | 118 | (9.8) | 1086 | (90.2) | 1204 | (100) | |||
| Rubella | Yes | 6 | (22.2) | 21 | (77.8) | 27 | (100) | 1.439 | 0.230 |
| No | 209 | (14.1) | 1275 | (85.9) | 1484 | (100) | |||
| Parotitis | Yes | 24 | (35.3) | 44 | (64.7) | 68 | (100) | 25.889 | ≤0.001a |
| No | 191 | (13.2) | 1252 | (86.8) | 1443 | (100) | |||
| Scarlet fever | Yes | 6 | (26.1) | 17 | (73.9) | 23 | (100) | 2.691 | 0.101 |
| No | 209 | (14.0) | 1279 | (86.0) | 1488 | (100) | |||
a
Chi-square test, p<0.05. MIH+: Affected. MIH−: Unaffected.