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 |