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Incidence of side effects at any time in the pregnancy.
| Adolescent | Adult | ||
| Nausea | |||
| Iron | 53% | 63% | |
| Placebo | 65% | 53% | |
| Vomiting | |||
| Iron | 41% | 35% | |
| Placebo | 41% | 21% | |
| Constipation | |||
| Iron | 29% | 24% | |
| Placebo | 12% | 28% | |
| Diarrhea | |||
| Iron | 13% | 14% | |
| Placebo | 17% | 24% | |
No significant differences in iron vs. placebo or adolescents vs. adults.
