Sociodemographic variables distribution, IAL cases and controls, Brazil, 1999-2005
| Cases (n = 202), n (%) | Controls (n = 440), n (%) | P | ||||
|---|---|---|---|---|---|---|
| Age at hospitalization (mo) | ||||||
| 0-15 | 103 (51.0) | 262 (59.5) | 0.04 | |||
| 16-21 | 99 (49.0) | 178 (40.5) | ||||
| Sex | ||||||
| Male | 100 (49.6) | 233 (53.0) | 0.488 | |||
| Female | 102 (50.4) | 207 (47.0) | ||||
| Race (skin color)* | ||||||
| White | 106 (52.5) | 156 (35.6) | 0.004 | |||
| Intermediate | 58 (28.7) | 142 (32.2) | ||||
| Black | 38 (18.8) | 142 (32.2) | ||||
| Maternal age (y) | ||||||
| <18 | 4 (2.0) | 39 (8.9) | 0.002 | |||
| 18-24 | 66 (32.7) | 185 (42.0) | ||||
| 25-34 | 99 (49.0) | 162 (36.8) | ||||
| >35 | 33 (16.3) | 54 (12.3) | ||||
| Population density (residence area) | ||||||
| <10,000 | 11 (5.4) | 18 (4.0) | 0.001 | |||
| 10,000-39,999 | 28 (13.9) | 36 (8.2) | ||||
| 40,000-99,999 | 27 (13.4) | 52 (11.9) | ||||
| 100,000-499,000 | 50 (24.8) | 83 (18.9) | ||||
| 500,000-1,000,000 | 18 (8.9) | 39 (8.9) | ||||
| >1,000,000 | 68 (33.7) | 212 (48.1) | ||||
| Geographic origin in Brazil | ||||||
| Southeast | 117 (57.9) | 251 (57.1) | 0.001 | |||
| Northeast | 51 (25.2) | 104 (23.6) | ||||
| South | 24 (11.9) | 51 (11.6) | ||||
| Central plateau | 10 (5.0) | 34 (7.7) | ||||
| Mother education (y) | ||||||
| <4 | 104 (51.5) | 208 (47.2) | 0.001 | |||
| 5-9 | 74 (36.6) | 198 (45.0) | ||||
| ≥10 | 24 (11.9) | 34 (7.7) | ||||
| Monthly family income† | ||||||
| <400 | 99 (49.0) | 276 (62.7) | 0.001 | |||
| 400-999 | 50 (24.8) | 111 (25.2) | ||||
| 1,000-1,999 | 35 (17.3) | 42 (9.5) | ||||
| ≥2,000 | 18 (8.9) | 11 (2.5) | ||||