Table 2

Descriptive statistics (numbers (N), mean with SD or percentage (%) and median with IQR) for demographic data of the study sample

	Female athletes				Male athletes				Total
	High joint impact	Intermediate joint impact	Low joint impact	Unclassified	High joint impact	Intermediate joint impact	Low joint impact	Unclassified	Female	Male
N athletes	651	159	239	353	743	244	505	410	1402	1902
Career length, years
Mean	11.1	10.6	10.6	10.3	13.7	13.2	13.2	13.0	10.7	13.3
(SD)	(5.5)	(6.7)	(5.8)	(5.4)	(5.6)	(5.9)	(6.4)	(5.7)	(5.7)	(5.9)
Median	10.0	9.0	10.0	9.5	13.0	13.0	12.0	13.0	10.0	13.0
(IQR)	(7.0)	(7.0)	(6.0)	(7.0)	(7.0)	(7.0)	(7.0)	(7.0)	(7.0)	(4.0)
Inclusion age*
Mean	39.5	46.5	42.8	45.1	48.2	51.3	54.4	51.7	42.3	51.0
(SD)	(12.3)	(19.0)	(14.8)	(15.9)	(15.4)	(18.9)	(18.5)	(18.3)	(14.8)	(17.5)
Median	39.0	42.0	40.0	42	47.0	48.5	52.0	48.0	40.0	48.0
(IQR)	(17)	(32)	(19)	(22)	(23)	(30)	(31)	(30)	(19)	(27)
THA
N of hips with THA	35	16	10	31	65	18	27	24	92	134
(%)	(2.7)	(5.0)	(2.1)	(4.4)	(4.4)	(3.6)	(2.7)	(2.9)	(3.3)	(3.5)
N of athletes with THA	27	10	8	26	54	15	18	23	71	110
(%)	(4.1)	(6.3)	(3.3)	(7.4)	(7.3)	(6.1)	(3.5)	(5.6)	(5.1)	(5.8)
BMI age 20
Mean	21.4	21.4	20.9	21.2	23.3	23.7	22.3	22.0	21.3	22.8
(SD)	(2.0)	(2.1)	(1.9)	(2.5)	(2.4)	(2.3)	(1.9)	(2.0)	(2.1)	(2.3)
Median	21.5	21.3	20.7	21.0	23.1	23.5	22.2	22.0	21.3	22.7
(IQR)	(2.7)	(2.8)	(2.5)	(2.7)	(2.3)	(2.8)	(2.0)	(2.6)	(2.8)	(2.6)

The athletes are stratified by sex and categorised by high, intermediate, low or unclassified joint impact sport participation.
*Age at questionnaire completion, year 2006.
BMI, body mass index; THA, total hip arthroplasty.