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Table 2 Comparison of demographics by intervention arm

From: Prevention of post-cardiac surgery vitamin D deficiency in children with congenital heart disease: a pilot feasibility dose evaluation randomized controlled trial

Patient characteristic High dose (n = 21) Usual care (n = 20)
Age (months), median (IQR) 4.6 (1.0–45.6) 3.8 (0.8–35.6)
Weight (kg), median (IQR) 5.4 (4.2–13.4) 5.8 (3.6–12.9)
Male sex, n (%) 10 (47.6%) 13 (65.0%)
Enrolment location, n (%)
 Cardiology 15 (71.4%) 15 (75.0%)
 NICU 4 (19.0%) 5 (25.0%)
 PICU 2 (9.5%) 0 (0.0%)
Surgery season, n (%)
 Winter 6 (28.6%) 5 (25.0%)
 Spring 3 (14.3%) 2 (10.0%)
 Summer 6 (28.6%) 8 (40.0%)
 Fall 6 (28.6%) 5 (25.0%)
RACHS, median (IQR) 2 (2–3) 3 (2–4)
Ethnicity, n (%)
 Caucasian 14 (66%) 14 (70.0%)
 Aboriginal 1 (5%) 1 (5.0%)
 Asian 0 (0%) 3 (15.0%)
 African/West Indian 2 (10%) 1 (5.0%)
 Unknown or others 4 (19%) 1 (5.0%)
Other active medical conditions, n (%) 7 (33.3%) 7 (35.0%)
Genetic 5 (71.4%) 3 (42.9%)
Chronic lung 1 (14.3%) 2 (28.6%)
Endocrine 1 (14.3%) 1 (14.3%)
Others 3 (42.9%) 4 (57.1%)
Expected time to surgery at enrolment, n (%)
 < 2 months 18 (86%) 18 (90%)
 > 2 months 3 (14%) 2 (10%)
Children ≤ 1 year, n (%)
 Breastfed 10 (83%) 9 (75%)
 Formula-fed 2 (17%) 3 (25%)