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Table 2 Neonatal characteristics 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
Birth weight ***            
Mean (SD), g 2128(406) 2323(431) 2592(429) 2433(463) 2887(455) 3115(414) 3269(385) 3401(392) 3545(391) 3292(442) 3289 (489)
SGA *** 17(11.3) 40(16.6) 69(15.1) 126(14.8) 163(14.2) 257(10.6) 298(8.9) 328(8.8) 156(6.9) 1202(9.3) 1328(9.6)
Gender            
Male 73(48.3) 124(51.5) 242(52.8) 439(51.6) 618(53.8) 1311(53.6) 1710(51.2) 1933(51.8) 1195(52.9) 6767(52.3) 7206(52.3)
Twin *** 50(33.1) 66(27.4) 105(22.9) 221(26.0) 108(9.4) 90(3.7) 14(0.4) 0 0 212(1.6) 233(1.7)
Malformation ** 6(4.0) 7(2.9) 7(1.5) 20(2.4) 27(2.4) 35(1.4) 35(1.1) 44(1.2) 23(1.3) 164(1.3) 184(1.3)
Delivery ***            
Spontaneous 68(45.0) 116(48.1) 295(64.4) 479(56.4) 815(70.9) 1821(74.5) 2961(88.6) 3341(89.6) 1946(86.1) 10884(84.2) 11363(82.5)
CS without labor 53(35.1) 104(43.2) 120(26.2) 277(32.6) 246(21.4) 459(18.8) 201(6.0) 79(2.1) 58(2.6) 1043(8.1) 1320(9.6)
CS with labor 30(19.9) 21(8.7) 43(9.4) 94(11.1) 88(7.7) 164(6.7) 181(5.4) 309(8.3) 257(11.4) 999(7.7) 1093(7.9)
Apgar < 7 at 5 min *** 5(3.3) 4(1.7) 2(0.4) 11(1.3) 6(0.5) 7(0.3) 8(0.2) 6(0.2) 6(0.3) 33(0.3) 44(0.3)
Resuscit. at birth *** 19(12.6) 40(16.6) 30(6.6) 89(10.5) 61(5.3) 64(2.6) 48(1.4) 50(1.3) 38(1.7) 261(2.0) 350(2.5)
Admission to NICU ***           
Yes 81(53.6) 92(38.2) 72(15.7) 245(28.8) 88(7.7) 93(3.8) 74(2.2) 83(2.2) 65(2.9) 403(3.1) 648(4.7)
Yes, for resp. disordersa 37(45.7) 38(41.3) 23(31.9) 98(40.0) 30(34.1) 26(28.0) 14(18.9) 21(25.3) 12(18.5) 103(25.6) 201(2.2)
Length of stay            
Median (IQR), days            
Total*** 7.8(5–13.1) 6(4.3–10.8) 4.3(3.3–6.3) 5.3(3.8–8.1) 3.6(2.8–4.9) 3.1(2.6–4.1) 3(2.5–3.4) 2.9(2.5–3.4) 3(2.6–3.6) 3(2.5–3.8) 3(2.6–4)
No NICU*** 5.1(4.3–6.2) 4.8(3.9–6.3) 4(3.2–5.4) 4.3(3.4–5.8) 3.4(2.7–4.4) 3.1(2.6–4) 2.9(2.5–3.4) 2.9(2.5–3.4) 2.9(2.6–3.6) 3(2.5–3.7) 3(2.6–3.8)
NICU*** 12(8.4–17) 12(7.1–15.2) 10.4(7.6–16) 11.6 (8–15.8) 8.9(6.6–14.5) 8.8(6.1–14.3) 8.7(6.7–10.7) 7.9(5.6–9.9) 7.7(5.1–10.2) 8.4(5.9–12.4) 9.2(6.7–14.3)
NICU resp. disorders 12(8–18.2) 10.5(6.9–14) 8.2(5.2–13.6) 10.2(7–15) 8.5(5.5–19.2) 6.9(5.1–12.2) 8.4(6.9–10.7) 9.8(8.3–13.2) 7.9(5.6–11.5) 8.6(6.1–13.2) 9.5(6.7–15)
Mortality *** 1(0.66) 3(1.2) 1(0.22) 5(0.6) 6(0.5) 2(0.08) 0(0.0) 1(0.03) 1(0.04) 10(0.08) 15(0.1)
Age at death            
Median (IQR), days 11 14(1–59) 8 11(8–14) 1(0–22) 25(23–27) - 2 0 1.5(0–23) 8(1–22.5)
  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). aProportions (%) calculated on the total of neonates admitted to neonatal intensive care unit (NICU), bP = 0.2 Mann–Whitney U test. ***P < .001, using χ2 or t test as appropriate, **P < .01.