. 2020 Mar 13;88(6):903–909. doi: 10.1038/s41390-020-0833-6

Table 1.

Characteristics, perinatal data, and respiratory viral infections during the 2 first years of life in 60 infants.

	Preterm, n = 16	Term, n = 44
(A) Birth
Gestational age, weeks^+days (range)	31⁺⁶ (27⁺⁶–33⁺⁵)^a	40⁺⁰ (37⁺⁶–42⁺³)^a
Birth weight, g	1894 ± 339^a	3517 ± 449^a
BMI z-score	−2.7 ± 1.2^a	0.3 ± 1.0^a
Male gender, n (%)	9 (56)	25 (57)
Maternal age, years	34 ± 4	32 ± 5
Premature rupture of membrane, n (%)	3 (19)	1 (2)
Cesarean section, n (%)	7 (44)	8 (18)
(B) Follow-up at 2 years of age
Chronological age, months	25.6 ± 3^a	22.6 ± 3^a
Weight, kg	13.0 ± 1	12.4 ± 1
BMI z-score	1.0 ± 1	0.6 ± 1
Postnatal growth per week, kg	0.10 ± 0.01^b	0.09 ± 0.01^b
Experienced one/several infections during the first year of life, n (%)	15 (94)	38 (86)
Bronchiolitis/admittance to hospital, n (%)	6 (38)^b	2 (5)^b

Mean values ± SD.

BMI body mass index.

^aSignificance level p < 0.01.

^bSignificance level p < 0.05.