Table 2.

Study Population. RSV: respiratory syncytial virus. * Home therapy before hospital admission (hypertonic solution and/or Bronchodilators and/or Cortisone for od).

	All (n = 233)	Bronchiolitis Mild (n = 160)	Bronchiolitis Moderate/Severe (n = 73)	p Value
Characteristics
Age, days (SD)	109.3 (±86.1)	122.7 (±92.1)	80 (±62.3)	0.001
Sex				0.019
Female, n° (%)	93 (39.9%)	72 (45%)	21 (28.8%)
Male, n° (%)	140 (60.1%)	88 (55%)	52 (71.2%)
Prematurity (n = 230)
Yes, n° (%)	20 (8.7%)	11 (7.0%)	9 (12.3%)	0.182
History of difficulty in feeding (n = 228)
Yes, n° (%)	151 (66.2%)	92 (59.4%)	59 (80.8%)	0.001
* Home therapy before hospital admission for three days (n = 231)
Yes, n° (%)	117 (50.6%)	85 (53.8%)	32 (43.8%)	0.159
Rhinorrhea (n = 231)
Yes, n° (%)	227 (98.3%)	156 (98.7%)	71 (97.3%)	0.425
Crackling noises on physical examination (n = 230)
Yes, n° (%)	198 (86.1)	134 (84.8%)	64 (88.9%)	0.407
Wheezing (n = 230)
Yes, n° (%)	154 (67%)	107 (67.7%)	47 (65.3%)	0.715
Fever (n = 231)
Yes, n° (%)	83 (35.9%)	52 (32.9%)	31 (42.5%)	0.159
Intercostal retractions (n = 231)
Yes, n° (%)	164 (71%)	96 (60.8%)	68 (93.2%)	0.001
Increased Respiratory Rate (n = 230)
Under 50 breath/min, n° (%)	75 (32.6%)	35 (22.3%)	40 (54.8%)	0.001
Between 51–60 breath/min, n° (%)	106 (46.1%)	95 (60.5%)	11 (15.1%)
Above 61, breath/min	49 (21.3%)	27 (17.2%)	22 (30.1%)
Oxygen saturation (n = 229)
Under 92% in aa, n° (%)	39 (17%)	10 (6.4%)	29 (39.7%)	0.001
Between 93–95% in aa, n° (%)	45 (19.7%)	17 (10.9%)	28 (38.4%)
Above 95% in aa, n° (%)	145 (63.3%)	129 (82.7%)	16 (21.9%)
RSV (n = 216)
Positive, n° (%)	126 (58.3%)	73 (51.0%)	53 (72.6%)	0.002
Chest X-ray (n = 228)
No, n° (%)	160 (70.2%)
Yes, n° (%)	68 (29.8%)	29 (18.7%)	39 (53.4%)	0.001
Hospitalization
Yes, n° (%)	192 (82.4%)	119 (74.4%)	73 (100.0%)	0.001
HFNC (n = 225)
Yes, n° (%)	50 (22.2%)	16 (10.5%)	34 (47.2%)	<0.001
nCPAP (n = 225)
Yes, n° (%)	5 (2.2%)	0 (0%)	5 (6.9%)	0.001