Table 1.

Baseline Characteristics of weekend vs. weekday groups and beginning of the week vs. end of the week Norwood

Variable	Weekend admission (N=71)	Weekday admission (N=462)	p value	Mon–Wed Norwood (N=336)	Thu–Fri Norwood (N=212)	p value
Male	46 (65%)	285 (62%)	0.7	211 (63%)	128 (60%)	0.6
Prenatally diagnosed	46 (65%)	374 (81%)	0.003	254 (76%)	165 (78%)	0.6
Gestational age, weeks, mean ±SD	37.9±2.0	38.2±1.5	0.2	38.2±1.6	38.1±1.6	0.3
Birth weight, kg, mean±SD	3.00±0.59	3.12±0.53	0.07	3.1±0.54	3.12±0.55	0.7
Birth weight <2.5 kg	15 (21%)	59 (13%)	0.07	46 (14%)	30 (14%)	0.9
APGAR at 1 minute, median (IQR)	8 (8,9)	8 (8,9)	0.9	8 (7,9)	8 (8,9)	0.5
APGAR at 5 minutes, median (IQR)	9 (8,9)	9 (8,9)	0.8	9 (8,9)	9 (8,9)	0.2
Hypoplastic Left Heart Syndrome	59 (83%)	400 (87%)	0.5	288 (86%)	185 (87%)	0.7
Genetic syndrome	4 (6%)	19 (4%)	0.04	15 (5%)	11 (5%)	0.9
Unknown/no genetic evaluation	31 (44%)	140 (30%)		107 (32%)	69 (33%)
Non-syndromic abnormality	9 (13%)	92 (20%)		65 (19%)	40 (19%)
Unknown/no evaluation	31 (44%)	139 (30%)	0.06	106 (32%)	69 (33%)	>0.9
Age at Norwood, days, median (IQR)	5 (4,6)	5 (3,7)		5 (4,6)	5 (3,7)
Center volume, per yr, median (IQR)	21.5 (17.1,32.2)	27.5 (17.1,32.2)		27.5 (17.1,32.2)	21.5 (17.1,32.2)
Center volume			0.7			0.009
≤15/yr	11 (16%)	82 (18%)	0.4	61 (18%)	32 (15%)	0.9
16–20/yr	19 (27%)	86 (19%)	0.4	61 (18%)	48 (23%)	0.6
21–30/yr	23 (32%)	144 (31%)		108 (32%)	38 (32%)
>30/yr	18 (25%)	150 (33%)		106 (32%)	34 (30%)
Surgeon Norwood volume, per yr median (IQR)	12 (7.9,14.8)	12.3 (6.9,13.6)		12.0 (6.9, 13.3)	12.6 (7.3,14.8)
Surgeon Norwood volume
≤5/yr	14 (20%)	93 (20%)	0.5	69 (21%)	39 (18%)	0.2
6–10/yr	14 (20%)	96 (21%)	>0.9	68 (20%)	45 (21%)	0.2
11–15/yr	31 (44%)	201 (44%)		154 (46%)	85 (40%)
>15/yr	12 (17%)	72 (16%)		45 (13%)	43 (20%)

APGAR – Appearance, Pulse, Grimace, Activity, Respiration, IQR – interquartile range, kg – kilograms, yr - year