Table 2.

Characteristics of haematomas

	Early surgery group (n=305)	Initial conservative treatment group (n=292)
Volume (mL)
Median (IQR; range)	38 (24–54; 10–100)	36 (22–58; 10–100)
Mean (SD)	41·4 (21·2)	41·0 (22·9)
Depth (mm)
Median (IQR; range)	1 (0–2; 0–10)	1 (0–2; 0–10)
Mean (SD)	1·6 (2·4)	1·6 (2·5)
Side of haemorrhage*
Left	158 (52%)	149 (51%)
Right	147 (48%)	142 (49%)

For continuous variables, data are median (IQR; range) and mean (SD); for categorical variables, data are number (%).

^*Data were missing for one patient in the initial conservative group for whom no forms were returned.