TABLE 1.

Reasons for deenrollment by group assignment

Group assignment	Deenrollment type						Passive withdrawal
	Protocol*	Adverse event	Medical	Permanent deferral	Active withdrawal†	Total	Known‡	Lost to follow-up
Iron status letter	5	N/A	1	0	3	9	5	27
No information letter	2	N/A	5	1	2	10	3	21
38 mg of iron	1	16	6	0	23	46	1	16
19 mg of iron	9	12	6	0	27	54	2	20
Placebo	5	11	14	0	34	64	2	19
Total	22	39	32	1	89	183	13	103

^*Subjects removed from study per protocol, e.g., determined to be taking vitamins with iron before enrollment or had ferritin level exceeding 300 ng/mL.

^†Includes those not wanting to take pills, physician recommended study withdrawal, or medical or surgical reasons unrelated to study.

^‡Known passive refusals are those who reported moving outside the study area.