Table 1.

Characteristics of randomized residents (N = 65)

Characteristics	Description
Grade
PGY1	22 (33.8%)
PGY2	21 (32.3%)
PGY3	22 (33.8%)
Sex
Male	17 (26.2%)
Female	48 (73.8%)
Age (year)	26 ± 2
Experience of ETI (time)	296 [92, 377]

Abbreviation: PGY, postgraduate year; ETI, endotracheal tube intubation. The categorial variable was described as number (percentage), normally distributed continuous variables were described as mean ± standardized deviation, and non-normally distributed continuous variables were described as median [interquartile range]