Odds ratios for H pylori seropositivity according to sex, family size, birth weight, weight at 1 year, and social class
| No of subjects | % H pylori positive | OR (95% CI) | p for trend1-150 | p for trend† | |
|---|---|---|---|---|---|
| Sex | |||||
| Men | 631 | 49 | 1.5 (1.1 to 1.9) | ||
| Women | 389 | 40 | 1.0 | 0.003 | 0.002 |
| No of siblings | |||||
| 0 | 97 | 28 | 1.0 | ||
| 1/2 | 371 | 41 | 1.8 (1.1 to 3.0) | ||
| 3/4 | 269 | 50 | 2.6 (1.6 to 4.3) | ||
| ⩾ 5 | 281 | 54 | 3.1 (1.9 to 5.1) | < 0.0001 | 0.0009 |
| Birth order | |||||
| 1st | 319 | 41 | 1.0 | ||
| 2nd/3rd | 407 | 43 | 1.1 (0.8 to 1.4) | ||
| 4th/5th | 164 | 53 | 1.6 (1.1 to 2.4) | ||
| > 5th | 127 | 56 | 1.8 (1.2 to 2.7) | 0.0005 | 1.0 |
| Birth weight, pounds (kg) | |||||
| ⩽ 5.5 (2.50) | 44 | 34 | 1.0 | ||
| – 6.5 (2.95) | 151 | 48 | 1.7 (0.9 to 3.5) | ||
| – 7.5 (3.41) | 317 | 41 | 1.3 (0.7 to 2.5) | ||
| – 8.5 (3.86) | 326 | 46 | 1.5 (0.8 to 3.0) | ||
| – 9.5 (4.32) | 127 | 54 | 2.1 (1.0 to 4.4) | ||
| > 9.5 (4.32) | 55 | 56 | 2.2 (1.0 to 5.0) | 0.03 | 0.002 |
| Weight at 1 year, pounds (kg) | |||||
| ⩽ 18 (8.18) | 75 | 51 | 2.6 (1.2 to 5.6) | ||
| – 20 (9.09) | 207 | 46 | 2.0 (1.0 to 4.0) | ||
| – 22 (10.00) | 330 | 48 | 2.0 (1.1 to 3.8) | ||
| – 24 (10.91) | 251 | 44 | 1.7 (0.9 to 3.2) | ||
| – 26 (11.82) | 109 | 43 | 1.5 (0.7 to 3.1) | ||
| > 26 (11.82) | 48 | 33 | 1.0 | 0.002 | 0.0008 |
| Social class at birth | |||||
| Manual | 147 | 46 | 1.1 (0.7 to 1.5) | ||
| Non-manual | 815 | 45 | 1.0 | 0.5 | 0.7 |
| Current social class | |||||
| Manual | 367 | 50 | 1.5 (1.1 to 1.9) | ||
| Non-manual | 643 | 39 | 1.0 | 0.005 | 0.1 |
Social class at birth was unclassifiable for 58 subjects, and current social class for 10 subjects.
↵1-150 By logistic regression, allowing for sex, † allowing for all other variables in the table.
OR = odds ratio; CI = confidence interval.