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Table 1 Characteristics of PTL/PTB Mothers Compared with Non-PTL/PTB Mothers at Delivery

From: Short and long-term costs among women experiencing preterm labour or preterm birth: the German experience

  PTL/PTB mothers Non-PTL/PTB mothers P –valuea
N = 2147 N = 8778
N (%) N (%)
Year of delivery 0.3403
 2009 395 (18.4) 1645 (18.7)  
 2010 420 (19.6) 1726 (19.7)  
 2011 413 (19.2) 1819 (20.7)  
 2012 472 (22.0) 1778 (20.3)  
 2013 447 (20.8) 1810 (20.6)  
Maternal age at deliveryb < 0.0001
 12–18 years 48 (2.2) 95 (1.1)  
 19–30 years 1276 (59.4) 5194 (59.2)  
 31–35 years 496 (23.1) 2232 (25.4)  
 36–44 years 327 (15.2) 1257 (14.3)  
Nulliparousc 1360 (63.3) 5224 (59.5) 0.0011
Caesarean section 885 (41.2) 2769 (31.5) < 0.0001
Birth plurality < 0.0001
 Singleton 1969 (91.7) 8709 (99.2)  
 Twin 173 (8.1) 64 (0.0)  
 Other multiple 5 (0.0) 3 (0.0)  
Charlson Comorbidity Indexd 0.0142
 0 1750 (81.5) 7332 (83.5)  
 1 315 (14.7) 1155 (13.2)  
 2 54 (2.5) 230 (2.6)  
 3 21 (1.0) 41 (0.5)  
 4+ 7 (0.3) 20 (0.2)  
Selected comorbiditiesd
 Gestational diabetes 237 (11.0) 893 (10.2) 0.2378
 Hypertension 93 (4.3) 243 (2.8) 0.0002
 Depression 83 (3.9) 334 (3.8) 0.8950
 Hypotension 66 (3.1) 268 (3.1) 0.9597
 Diabetes mellitus 50 (2.3) 113 (1.3) 0.0004
  1. aP-values compare PTL/PTB mothers with non-PTL/PTB mothers, and are calculated using the chi-squared test/Fisher’s Exact test in instances when expected cell counts < 5
  2. bValues are rounded to the nearest whole number
  3. cRefers to parity preceding index delivery
  4. dMeasured during the nine-month baseline period, diagnoses in inpatient or outpatient setting
  5. Abbreviations: PTB preterm birth, PTL preterm labour