Table 3 Demographics and clinical characteristics of neonates (≤28 days of life) and young infants (29–60 days of life) in the three study periods.

From: Severity of respiratory syncytial virus through the COVID-19 pandemic among infants aged ≤2 months: a secondary analysis of the IRIDE cohort study

Characteristics

2018–2019

2021–2022

2022–2023

p1

p2

Neonates/Young infants

≤28 DOL

29–60 DOL

≤28 DOL

29–60 DOL

≤28 DOL

29–60 DOL

  

N

111

354

209

462

211

469

  

Age, days [IQR]

18 [14.1, 23.1]

45 [30, 60]

18.9 [15, 24]

45 [30, 60]

18 [12.9, 23.1]

45 [30, 60]

0.192

0.387

Sex

 Female, n (%)

60 (54.1)

153 (43.2)

106 (50.7)

221 (47.8)

77 (36.5)

211 (45.0)

0.002

0.405

 Male, n (%)

51 (45.9)

201 (56.8)

103 (49.3)

241 (52.2)

134 (63.5)

258 (55.0)

  

Gestational age, weeks (SD)

38.80 (1.57)

38.52 (2.01)

38.95 (1.48)

38.54 (1.77)

38.76 (1.44)

38.62 (1.73)

0.484

0.747

Weight, grams (SD)

3258.53 (495.11)

3159.98 (550.43)

3345.03 (434.56)

3199.19 (526.79)

3239.70 (442.47)

3178.66 (499.63)

0.073

0.628

Preterm birth (<37 wks), n (%)

6 (7.4)

38 (13.2)

13 (7.2)

38 (10.4)

10 (6.1)

34 (10.1)

0.901

0.402

Number of siblings, n [IQR]

1 [0.25, 1.00]

1 [0.00, 1.00]

1 [1.00, 2.00]

1 [1.00, 1.00]

1 [1.00, 1.00]

1 [0.00, 1.00]

0.069

0.093

Breastfeeding, n (%)

74 (77.9)

240 (80.8)

170 (84.6)

310 (74.9)

140 (80.5)

303 (81.9)

0.331

0.036

Radiologically confirmed pneumonia

 Yes, n (%)

26 (23.4)

68 (19.2)

40 (19.1)

74 (16.0)

28 (13.3)

58 (12.8)

0.036

<0.001

 No, n (%)

32 (28.8)

117 (33.1)

76 (36.4)

140 (30.3)

62 (29.4)

92 (20.3)

  

Rx not performed, n (%)

53 (47.7)

169 (47.7)

93 (44.5)

248 (53.7)

121 (57.3)

303 (66.9)

  

Antibiotic therapy, n (%)

55 (49.5)

160 (45.2)

69 (33.0)

159 (34.5)

73 (34.6)

144 (30.7)

0.009

<0.001

Corticosteroid therapy, n (%)

21 (18.9)

97 (27.5)

32 (15.3)

165 (35.8)

37 (17.5)

166 (35.4)

0.685

0.022

Discharge ward

 Emergency unit - n (%)

1 (0.9)

11 (3.1)

1 (0.5)

9 (1.9)

0 (0.0)

11 (2.3)

0.568

0.176

 Neonatal care unit - n (%)

56 (50.5)

50 (14.1)

117 (56.0)

55 (11.9)

121 (57.3)

80 (17.1)

  

 Pediatric - n (%)

54 (48.6)

293 (82.8)

91 (43.5)

398 (86.1)

90 (42.7)

378 (80.6)

  

Death - n (%)

0

1 (0.3)

0

1 (0.2)

0

0 (0.0)

0

0.56

  1. p1: comparison of neonates (≤28 DOL) characteristics.
  2. p2: comparison of young infants (29–60 DOL) characteristics.
  3. Significant p-values highlighted in bold.