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Table 1 Baseline characteristics of study population by treatment arm and malaria status in early pregnancy

From: The efficacy of low-dose aspirin in pregnancy among women in malaria-endemic countries

Variable ALL CALL COUNTRIES
LDA (N = 724) PLACEBO (N = 722)
Malaria negative Malaria positive Malaria negative Malaria positive
Randomized, N (%) 445 (61) 279 (39) 439 (61) 283 (39)
Maternal age (years), N (%)
   < 20 225 (50·6) 209 (74·9) 250 (56·9) 206 (72·8)
  20–29 214 (48·1) 69 (24·7) 185 (42·1) 74 (26·1)
   > 29 6 (1·3) 1 (0·4) 4 (0·9) 3 (1·1)
  Median (P25, P75) 19·0 (18·0, 22·0) 18·0 (17·0, 19·5) 19·0 (18·0, 21·0) 18·0 (17·0, 20·0)
Projected gestational age at enrollment (weeks, days), N (%)
 6, 0 – 7, 6 63 (14·2) 30 (10·8) 72 (16·4) 26 (9·2)
 8, 0 – 9, 6 134 (30·1) 75 (26·9) 114 (26·0) 76 (26·9)
 10, 0 – 10, 6 66 (14·8) 33 (11·8) 57 (13·0) 31 (11·0)
 11, 0 – 11,6 47 (10·6) 48 (17·2) 66 (15·0) 54 (19·1)
 12, 0 – 13, 6 135 (30·3) 93 (33·3) 130 (29·6) 96 (33·9)
 Median (P25, P75) 10·3 (8·7, 12·3) 11·0 (9·1, 12·4) 10·6 (8·4, 12·1) 11·1 (9·0, 12·4)
Maternal education, N (%)
 No formal 20 (4·5) 25 (9·0) 19 (4·3) 24 (8·5)
 Primary 58 (13·0) 84 (30·1) 60 (13·7) 97 (34·3)
 Secondary 334 (75·1) 158 (56·6) 327 (74·5) 156 (55·1)
 University +  33 (7·4) 12 (4·3) 33 (7·5) 6 (2·1)
Maternal height (cm), N
 Mean (StdDev) 157·0 (7·5) 155·6 (8·0) 157·0 (7·4) 155·2 (7·9)
 Median (P25, P75) 158·0 (152·5, 162·0) 156·0 (150·2, 161·0) 157·0 (152·5, 161·9) 155·0 (150·0, 160·0)
Maternal weight (kg), N
 Mean (StdDev) 55·0 (8·1) 53·0 (7·4) 55·0 (8·3) 52·3 (7·5)
 Median (P25, P75) 54·0 (50·0, 59·0) 52·2 (48·0, 58·0) 54·0 (50·0, 60·0) 52·0 (47·0, 56·8)
Maternal BMI (kg/m2), N
 Mean (StdDev) 22·4 (3·4) 22·0 (3·1) 22·3 (3·4) 21·8 (3·1)
 Median (P25, P75) 21·1 (20·0, 24·0) 21·7 (19·7, 23·4) 21·9 (20·0, 24·1) 21.5 (19·5, 23·3)
Antenatal care visits, N
 Mean (StdDev) 4·2 (1·1) 3·9 (1·3) 4·2 (1·1) 3·9 (1·2)
 Median (P25, P75) 4·0 (4·0, 5·0) 4·0 (3·0, 5·0) 4·0 (4·0, 5·0) 4·0 (3·0, 5·0)
Delivery attendant, N (%)
 Physician 24 (5·4) 9 (3·2) 18 (4·1) 9 (3·2)
 Nurse/nurse midwife 391 (87·9) 241 (86·4) 383 (87·2) 239 (84·5)
 Traditional birth attendant 19 (4·3) 22 (7·9) 23 (5·2) 30 (10·6)
 Family/Self/Other 11 (2·5) 7 (2·5) 15 (3·4) 5 (1·8)
Delivery location, N (%)
 Hospital 113 (25·4) 58 (20·8) 122 (27·8) 46 (16·3)
 Clinic/health center 296 (66·5) 180 (64·5) 270 (61·5) 194 (68·6)
 Home/Other 36 (8·1) 41 (14·7) 47 (10·7) 43 (15·2)
Delivery mode, N (%)
 Vaginal 426 (95·7) 271 (97·1) 422 (96·1) 276 (97·5)
 C-section 19 (4·3) 8 (2·9) 17 (3·9) 7 (2·5)
Site, N (%)
 DRC 87 (19·6) 140 (50·2) 85 (19·4) 157 (55·5)
 Kenya 199 (44·7) 130 (46·6) 199 (45·3) 114 (40·3)
 Zambia 159 (35·7) 9 (3·2) 155 (35·3) 12 (4·2)