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Table 3 Sociodemographic and obstetric conditions among twin and single deliveries according to the occurrence of any Adverse Perinatal Outcome (APO). WHO Multicountry Survey, 2010–2011

From: Perinatal outcomes in twin pregnancies complicated by maternal morbidity: evidence from the WHO Multicountry Survey on Maternal and Newborn Health

Perinatal outcomes Twin deliveries n (%) Singleton deliveries n (%) Total p-value*
  APO No APO APO No APO   
Maternal agea       < 0.001
  < 18 49 (1.6) 22 (1.4) 3987 (4.1) 6971 (3.4) 11,029  
 18–35 2693 (87.1) 1296 (85.0) 86,375 (88.3) 179,196 (87.6) 269,560  
  > 35 349 (11.3) 206 (13.5) 7510 (7.7) 18,420 (9.0) 26,485  
Maternal education (years)b       < 0.001
 0–4 694 (24.6) 259 (18.1) 21,295 (23.4) 34,647 (18.3) 56,895  
 5–9 865 (30.7) 414 (28.9) 29,664 (32.6) 57,190 (30.3) 88,133  
  > 10 1263 (44.8) 758 (53.0) 40,025 (44.0) 97,219 (51.4) 139,265  
Parityc       < 0.001
 0 1121 (36.3) 401 (26.3) 47,293 (48.3) 81,773 (39.9) 130,588  
 1–2 1306 (42.3) 793 (52.1) 37,017 (37.8) 88,631 (43.3) 127,747  
  > 2 661 (21.4) 329 (21.6) 13,681 (14.0) 34,487 (16.8) 49,158  
Marital statusd       0.013
 With no partner 251 (8.2) 91 (6.0) 10,898 (11.2) 19,766 (9.7) 31,006  
 With partner 2825 (91.8) 1422 (94.0) 86,434 (88.8) 183,915 (90.3) 274,596  
Gestational age at deliverye       < 0.001
  < 34 weeks 488 (15.8) 74 (4.8) 5966 (6.1) 1329 (0.6) 7857  
 34–36 weeks 619 (20.1) 435 (28.5) 5850 (6.0) 8838 (4.3) 15,742  
  ≥ 37 weeks 1972 (64.0) 1017 (66.6) 86,010 (87.9) 195,007 (95.0) 284,006  
Onset of labourf       < 0.001
 Spontaneous 3902 (67.2) 1611 (62.9) 74,825 (76.4) 159,268 (77.7) 239,606  
 Induced 455 (7.8) 162 (6.3) 11,572 (11.8) 20,638 (10.1) 32,827  
 Elective C-section 1446 (24.9) 787 (30.7) 11,561 (11.8) 25,054 (12.2) 38,848  
Mode of deliveryg       < 0.001
 Vaginal birth 1575 (50.8) 691 (45.3) 70,422 (71.8) 146,340 (71.3) 219,028  
 Cesarean section 1525 (49.2) 835 (54.7) 27,701 (28.2) 58,834 (28.7) 88,895  
Maternal complicationsh       < 0.001
 No complications 2606 (84.1) 1312 (86.0) 88,416 (90.1) 194,250 (94.7) 286,584  
 PLTC 425 (13.7) 200 (13.1) 8567 (8.7) 10,365 (5.1) 19,557  
 MNM 53 (1.7) 13 (0.9) 921 (0.9) 507 (0.2) 1494  
 MD 16 (0.5) 1 (0.1) 221 (0.2) 52 (0.0) 290  
Total 5810 2562 98,128 205,178 311,678  
  8372 303,306   
  1. *design-based p-value
  2. Missing information for: a: 9597; b: 32378; c: 9178; d: 11069; e: 9066; f: 5390; g: 8748; and h: 8746 cases
  3. APO any Adverse Perinatal Outcome (Apgar score at 5th min < 7 OR Perinatal death OR NICU admission OR SGA)
  4. MD maternal death, MNM maternal near miss, PLTC potentially life-threatening condition