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Table 1 Demographic data of the study population and outdoor/indoor thermal data byseason

From: Seasonal variation in the international normalized ratio of neonates and its relationship with ambient temperature

  Spring (n = 117) Summer (n = 157) Autumn (n = 96) Winter (n = 118) P value
Male gender, n (%) 59 (50) 73 (46) 54 (56) 57 (48) 0.50
Gestational age, wks 39.3 ± 1.1 39.4 ± 1.2 39.5 ± 1.1 39.4 ± 1.2 0.42
Birth weight, g 3078 ± 361 3038 ± 337 3084 ± 370 3100 ± 335 0.49
Hematocrit level, % 51.4 ± 5.6 52.4 ± 5.9 52.0 ± 6.0 52.2 ± 5.6 0.59
INR level 1.07 ± 0.08 1.11 ± 0.10 1.07 ± 0.09 1.06 ± 0.07 < 0.001
Climatic conditions      
Maximum temperature, °C 20.4 ± 3.8 31.2 ± 3.8 22.2 ± 5.8 10.8 ± 2.9 < 0.001
Minimum temperatue, °C 10.6 ± 4.5 23.5 ± 2.6 13.8 ± 5.2 3.1 ± 3.4 < 0.001
Average temperature, °C 15.3 ± 3.8 27.3 ± 3.0 18.0 ± 5.4 7.0 ± 3.0 < 0.001
Relative humidity, % 49.0 ± 20.4 66.0 ± 10.6 56.0 ± 17.2 46.6 ± 15.3 < 0.001
Thermal environment of the newborn nursery      
Room temperature, °C 26.7 ± 0.5 26.0 ± 0.4 26.3 ± 0.5 26.5 ± 0.4 <0.001
Relative humidity, % 31.3 ± 9.1 64.1 ± 6.7 38.9 ± 14.1 25.8 ± 3.3 <0.001
  1. Values are presented as mean ± standard deviation (SD) unless otherwise indicated INR, intenational normalized ratio