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Table 1 Maternal data by gestational age in weeks

From: Short-term respiratory outcomes in late preterm infants

  34 35 36 LPI 37 38 39 40 41 TI 34-41
  n = 151 n = 241 n = 458 n = 850 n = 1149 n = 2444 n = 3343 n = 3729 n = 2261 n = 12926 n = 13776
Age            
Mean (SD) 32.4(5.4) 31.7(6.6) 32.9(4.8) 32.5(5.5) 32.7(5.2) 32.5(5.1) 32.1(5.0) 32.1(5.1) 31.9(5.0) 32.2(5.1) 32.2(5.2)
Number of US ***            
Mean (SD) 4.7(2.3) 5.0(2.8) 5.2(4.7) 5.1(4.0) 4.5(3.4) 4.0(2.2) 3.6(1.6) 3.5(1.5) 3.5(2.0) 3.7(2.0) 3.9(2.1)
Ethnicity            
Caucasian 119(89.5) 181(85.0) 357(86.9) 657(86.8) 933(88.0) 1953(85.8) 2722(88.1) 3097(88.6) 1852(88.0) 10557(87.8) 11214(81.4)
African 7(5.3) 10(4.7) 21(5.1) 38(5.0) 51(4.8) 115(5.1) 135(4.4) 155(4.4) 115(5.5) 571(4.8) 609(4.4)
Hispanic 3(2.3) 18(8.4) 22(5.4) 43(5.7) 41(3.9) 112(4.9) 138(4.5) 128(3.7) 71(3.4) 490(4.0) 533(3.8)
Asian 4(3.0) 4(1.9) 11(2.7) 19(2.5) 35(3.3) 97(4.3) 94(3.0) 114(3.3) 67(3.2) 407(3.4) 426(3.1)
ART ***            
Yes 4(2.9) 3(1.3) 6(1.3) 13(1.6) 16(1.4) 12(0.5) 15(0.5) 14(0.4) 7(0.3) 64(0.5) 73(0.5)
Medical disorders ***            
Yes 53(45.7) 83(40.5) 128(32.6) 264(37.0) 281(27.6) 422(18.8) 265(8.6) 288(8.4) 151(7.4) 1407(11.9) 1671(12.1)
  1. Data are expressed as absolute numbers and proportions (%) of observed data in each category, unless otherwise specified. All tests refer to comparisons between late preterm infants (LPI) and term infants (TI). US ultrasounds; ART assisted reproductive technologies. ***P < .001, using χ2, Fisher or t test as appropriate.