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Table 1 Cohort demographics

From: Influence of the number and timing of malaria episodes during pregnancy on prematurity and small-for-gestational-age in an area of low transmission

  Main analysis, N = 50,060 Analysis of rates of malaria over gestational age, N = 19,768
Variable No malaria, N = 41,839 Malaria, N = 8221 No malaria, N = 16,841 Malaria, N = 2927
EGA at 1st ANC, weeks’ gestation 15.6 {9.6, 23.8}, 0.0–42.0 14.8 {9.5, 22.1}, 0.0–41.1 7.6 {6.4, 8.7}, 0.0–10.0 7.5 {6.1, 8.7}, 0.0–10.0
EGA method
 Ultrasound 24,398 (58) 3809 (46) 12,385 (74) 1834 (63)
 Dubowitz 9368 (22) 1727 (21) 1767 (10) 401 (14)
 Fundal height 6171 (15) 2108 (26) 920 (5) 375 (13)
 LMP 1902 (5) 577 (7) 1769 (11) 317 (11)
Maternal age, years 25 {21, 30}, 13–53 24 {20, 30}, 14–48 26 {21, 31}, 13–52 24 {20, 30}, 13–45
Primigravid 11,107 (27) 2383 (29) 4018 (24) 868 (30)
Anaemiaa 3911 (11) 1369 (20) 1508 (9) 485 (17)
Haematocrit,a % 34 {31, 36}, 10–53 33 {30, 35}, 16–49 34 {32, 37}, 10–49 33 {30, 35}, 16–48
Current smokerb 7551 (23) 1897 (35) 3653 (24) 817 (35)
Site
 Refugee 30,103 (72) 4649 (57) 12,218 (73) 1275 (44)
 Migrant 11,736 (28) 3572 (43) 4623 (27) 1652 (56)
Place of delivery
 SMRU unit 24,502 (66) 3218 (46) 7612 (69) 977 (47)
 At home 9406 (25) 3118 (45) 2509 (23) 878 (43)
 Hospital 3149 (8) 598 (9) 984 (9) 205 (10)
  1. Numbers are median {interquartile range}, range or frequency (%). Missing (main analysis): maternal age: 30 [<0.0%] (no malaria 25 [<0.0%]; malaria 5 [<0.0%]); smoking status 11,469 [23%] (no malaria 8651 [21%]; malaria 2818 [34%]); haematocrit 7012 [14%] (no malaria 5618 [13%]; malaria 1394 [17%])
  2. EGA estimated gestational age, ANC antenatal clinic, LMP last menstrual period
  3. aMeasured at the last antenatal consultation (within 1 month of delivery for 90% of women)
  4. bSmoking information was only routinely collected from 1997