Comparability of vitamin A and placebo groups, all live births from 1 June 2003 to 30 September 2008
| Characteristic | Placebo, n (%*) | Vitamin A, n (%*) |
| Live births in study population (n) | 31 164 (100) | 31 498 (100) |
| Age group at the birth outcome, years | ||
| <20 | 2404 (8) | 2536 (8) |
| 20–24 | 7645 (25) | 7747 (25) |
| 25–29 | 8866 (28) | 8993 (29) |
| 30–34 | 6848 (22) | 6818 (22) |
| 35–39 | 3784 (12) | 3752 (12) |
| ≥40 | 1617 (5) | 1652 (5) |
| Previous live births (n) | ||
| 0 | 3463 (11) | 3628 (12) |
| 1 | 6032 (19) | 6061 (19) |
| 2 | 5812 (19) | 5719 (18) |
| 3 | 4628 (15) | 4888 (15) |
| 4 | 3664 (12) | 3714 (12) |
| 5+ | 7217 (23) | 7179 (23) |
| Not known | 348 (1) | 309 (1) |
| Highest educational level | ||
| None | 12 142 (39) | 12 280 (39) |
| Primary school | 5812 (19) | 5865 (19) |
| Secondary school | 12 515 (40) | 12 636 (40) |
| Technical college or university | 262 (1) | 281 (1) |
| Not known | 433 (1) | 436 (1) |
| Religion | ||
| Christian | 20 663 (66) | 20 721 (66) |
| Muslim | 7428 (24) | 7594 (24) |
| Traditional African | 1718 (6) | 1803 (6) |
| Other | 939 (3) | 961 (3) |
| Not known | 416 (1) | 419 (1) |
| Ethnic group | ||
| Akan | 13 361 (43) | 13 693 (43) |
| Other | 17 392 (56) | 17 386 (55) |
| Missing | 411 (1) | 419 (1) |
| Wealth quintiles | ||
| 1st (poorest) | 8039 (26) | 8339 (26) |
| 2nd | 6743 (22) | 6666 (21) |
| 3rd | 5668 (18) | 5768 (18) |
| 4th | 5177 (17) | 5171 (16) |
| 5th (richest) | 4618 (15) | 4670 (15) |
| Not known | 919 (3) | 884 (3) |
↵* Percentages may not add up to 100 due to rounding.