Table 1.

Comparison of the demographic characteristics between the early and late MRI groups

Parameter	Early MRI group ( n  = 89)	Late MRI group ( n  = 65)	P -value
Number of male patients*	73 (82)	61 (94)	0.031
Age (years)†	31.4  ±  9.8	33.8  ±  9.1	0.124
Time from MRI to physical examination (days)†	34.2  ±  21.8	35.3  ±  24.0	0.939
Time from injury to MRI (days)	18 (5–37)	733 (201–1915)	NA

Data of age and the time from MRI to physical examination are presented as means  ±  standard deviations. Number of male patients is presented as n (%). Time from injury to MRI is presented as the median with interquartile range in parentheses. *Statistical analyses were performed using the chi-squares test. ^†Statistical analyses were performed using Student’s t test. Abbreviations: MRI magnetic resonance imaging, NA not applicable.