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Table 2 Comparison of mean bilirubin levels before, 6 h after, and 24 h after intervention in study groups

From: Efficacy of zinc sulfate on indirect hyperbilirubinemia in premature infants admitted to neonatal intensive care unit: a double-blind, randomized clinical trial

Study groupExperimental Mean ± Standard deviation (\( \overline{\mathrm{X}}\pm SD\Big) \)Control Mean ± Standard deviation (\( \overline{\mathrm{X}}\pm SD\Big) \)Independent t-test
Time point
Before intervention (mg/dL)
6 h after intervention (mg/dL)
24 h after intervention (mg/dL)
12.2 ± 71.6710.2 ± 35.24 
11.2 ± 26.629.2 ± 86.32
9.2 ± 45.838.2 ± 44.10
Repeated measures ANOVA resultP < 0.001  
Bonferroni post-hoc test resultBefore and six hours after intervention (p = 0.004)
Before and 24 h after intervention (p < 0.001)
Six hours and 24 after intervention (p < 0.001)
Before and six hours after intervention (p = 0.001)
Before and 24 h after intervention (p < 0.001)
Six hours and 24 after intervention (p < 0.001)