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Table 1 Baseline characteristics by trial arm of participants who subsequently became pregnant or remained non-pregnant during follow-up

From: Effects of long-term weekly iron and folic acid supplementation on lower genital tract infection – a double blind, randomised controlled trial in Burkina Faso

Variable Pregnant cohort Non-pregnant cohort
Na Iron Control Na Iron Control
  N = 258 N = 220   N = 766 N = 783
Sociodemographic
Age, years, mean (SD) 478 17.1 (1.7) 17.1 (1.7) 1549 16.7 (1.7) 16.7 (1.8)
 Ethnic group, n (%)
  Mossi 478 250 (96.9) 214 (97.3) 1548 730 (95.3) 757 (96.8)
  Other 478 8 (3.1) 6 (2.7) 1548 36 (4.7) 25 (3.2)
 Marital status       
  Married 478 22 (8.5) 15 (6.8) 1544 17 (2.2) 18 (2.3)
  Never married 478 236 (91.5) 204 (92.7) 1544 748 (97.8) 760 (97.6)
  Previously married 478 0 (0) 1 (0.5) 1544 0 (0) 1 (0.1)
 Occupation,b n (%)
  Student 478 60 (23.3) 51 (23.2) 1549 255 (33.3) 274 (35.0)
  Trading 478 10 (3.9) 10 (4.5) 1549 24 (3.1) 21 (2.7)
  Domestic labour 478 154 (59.7) 120 (54.5) 1549 401 (52.3) 407 (52.0)
  Farming 478 130 (50.4) 101 (45.9) 1549 269 (35.1) 290 (37.0)
  Other 478 3 (1.2) 3 (1.4) 1549 3 (0.4) 2 (0.3)
 Education, n (%)
  No schooling 477 176 (68.5) 142 (64.5) 1544 447 (58.6) 450 (57.6)
  Primary 478 54 (20.9) 38 (17.3) 1549 168 (21.9) 169 (21.6)
  Lower secondary 477 24 (9.3) 38 (17.3) 1544 144 (18.9) 153 (19.6)
  Higher secondary 477 3 (1.2) 2 (0.9) 1544 4 (0.5) 9 (1.2)
 Literate, n (%) 473 68 (26.7) 62 (28.4) 1530 278 (36.8) 297 (38.4)
Reproductive history and infections, n (%)
 Menarcheal 478 241 (93.4) 203 (92.3) 1549 639 (83.4) 645 (82.4)
 Menarche age, mean (SD) 443 14.9 (1.0) 14.8 (1.1) 1279 15 (1.0) 15.1 (1.1)
 Ever had sex 478 98 (38) 82 (37.3) 1548 159 (20.8) 164 (21.0)
 Uses contraception 478 54 (20.9) 51 (23.2) 1549 106 (13.8) 86 (11.0)
 Uses condoms 478 53 (20.5) 50 (22.7) 1549 103 (13.4) 81 (10.3)
 Nugent 7–10 391 33 (15.7) 23 (12.7) 1247 80 (13.0) 68 (10.8)
 Nugent 4–6 391 17 (8.1) 11 (6.1) 1247 49 (8.0) 66 (10.5)
 Nugent 0–3 391 160 (76.2) 147 (81.2) 1247 487 (79.1) 497 (78.8)
 Vaginal discharge 478 3 (1.2) 4 (1.8) 1549 13 (1.7) 12 (1.5)
 Vaginal pH ≥ 4.5 394 119 (55.9) 84 (46.4) 1280 317 (50.3) 328 (50.5)
Nutrition and iron biomarkers, n (%)
 Drinks alcohol 476 140 (54.5) 119 (54.3) 1549 372 (48.6) 380 (48.5)
 BMI, kg/m2, mean (SD) 478 20.2 (1.8) 20.3 (2.1) 1549 19.7 (2.2) 19.6 (2.2)
 MUAC, cm, mean (SD) 478 24.1 (1.8) 24.3 (2.2) 1549 23.6 (2.1) 23.6 (2.2)
 Iron deficient (adjFE) 467 25 (10.0) 26 (12.0) 1528 84 (11.1) 100 (13.0)
 Iron deficient (ratio sTfR/log ferritin) 470 52 (20.6) 55 (25.3) 1524 162 (21.4) 168 (21.9)
Adherence to treatment
 DOT,c mean (SD) 478 70.3 (27.0) 71.4 (26.0) 1549 70.0 (27.8) 70.8 (26.3)
  1. aTotal responders
  2. bMore than one response allowed
  3. cNumber of directly observed treatments as a percentage of the number of weeks from enrolment to assessment
  4. adjFE adjusted ferritin, BMI body mass index, DOT directly observed treatment, MUAC mid-upper arm circumference, SD standard deviation, sTfR serum transferrin receptor