Table.
Distribution of 134 cases and 134 controls according to selected characteristics and by matched sets
| Factor | No of cases | No of controls | Matched sets* | Odds ratio (95% CI)
|
||
|---|---|---|---|---|---|---|
| Univariate† | Multivariate‡ | Multivariate§ | ||||
| Helicobacter pylori: | ||||||
| Positive | 27 | 18 | 225 | |||
| Negative | 107 | 116 | 1691 | 1.6 (0.8 to 2.9) | 0.8 (0.3 to 2.2) | 1.3 (0.5 to 3.3) |
| Father’s height (cm): | ||||||
| <165 | 54 | 7 | 351 | |||
| ⩾165 | 80 | 127 | 476 | 12.7 (4.6 to 35.3) | 8.7 (2.8 to 27.6) | |
| Mother’s height (cm): | ||||||
| <155 | 69 | 13 | 762 | |||
| ⩾155 | 65 | 121 | 659 | 10.3 (4.5 to 23.9) | 8.0 (3.0 to 20.9) | |
| Mean parental height (cm): | ||||||
| <160 | 62 | 5 | 260 | |||
| ⩾160 | 72 | 129 | 369 | 20.0 (6.3 to 63.8) | 28.6 (7.3 to 112) | |
| Parents’ education (years): | ||||||
| <12 | 28 | 11 | 523 | |||
| ⩾12 | 106 | 123 | 6100 | 3.8 (1.6 to 9.4) | 2.1 (0.9 to 6.4) | |
| Birth weight (g): | ||||||
| <2850 | 38 | 17 | 731 | |||
| ⩾2850 | 96 | 117 | 1086 | 3.1 (1.5 to 6.3) | 9.6 (2.4 to 37.9) | |
| Crowding index (subjects/room): | ||||||
| ⩾1 | 17 | 7 | 215 | |||
| <1 | 117 | 127 | 5112 | 3.0 (1.1 to 8.2) | 6.9 (1.0 to 48.7) | |
| Pets (No of types): | ||||||
| >1 | 24 | 7 | 123 | |||
| 0-1 | 110 | 127 | 6104 | 3.8 (1.6 to 9.4) | 1.9 (0.6 to 5.9) | |
*
Distribution of matched sets according to combination of exposure status (positive or negative) for each case and control.
†
McNemar’s test based on matched sets.
‡
Conditional logistic regression model including terms for H pylori, father’s height, mother’s height, parental education, and presence of pets.
§
Conditional logistic regression model including terms for H pylori, mean parental height, birth weight, and crowding index.