Table 2.

Unadjusted and adjusted incidence rate ratios (IRRs) of factors associated with race-day falls by flat racing jockeys (n=7) from 1 June 2007 to 31 May 2009, and with falls during track-work for track-work riders (n=7) from 1 March 2008 to 31 May 2009

Study factor	Falls	Rides	Unadjusted	Adjusted
			IRR (95% CI)	IRR (95% CI)†
Licence
Jockey	13	2978	1.00	1.00
Track-work rider	24	2996	1.84 (0.90 to 3.74)	3.54 (2.07 to 6.06)***
Sex
Male	15	2519	1.00	1.00
Female	22	3455	1.07 (0.52 to 2.19)	0.45 (0.17 to 1.20)
Age	37	5974	1.03 (1.00 to 1.06)	1.05 (1.01 to 1.10)*
Body mass index	37	5974	1.12 (1.02 to 1.21)*	1.15 (1.08 to 1.23)***
Log of balance pooled (s)	37	5974	0.87 (0.59 to 1.28)	1.28 (0.95 to 1.72)
Flexibility (cm)	37	5974	0.99 (0.94 to 1.04)	0.96 (0.91 to 1.01)
Muscular strength and power
Push strength (kg)	37	5974	1.00 (0.97 to 1.03)	1.00 (0.96 to 1.04)
Pull strength (kg)	37	5974	1.03 (0.98 to 1.09)	1.09 (1.04 to 1.14)***
Leg/back strength (kg/10)	37	5974	1.11 (1.00 to 1.23)*	1.05 (0.98 to 1.13)
Pooled grip strength (kg)	37	5974	1.05 (0.96 to 1.13)	1.02 (0.96 to 1.09)
Absolute jump height (cm)	37	5974	0.97 (0.92 to 1.02)	0.93 (0.85 to 1.01)
Mean power (W/kg)	37	5974	1.19 (0.94 to 1.50)	1.14 (0.91 to 1.42)
Anaerobic fitness
Mean power (W/kg)	37	5974	0.90 (0.77 to 1.05)	0.85 (0.67 to 1.09)
Peak power (W/kg)	37	5974	0.91 (0.82 to 1.00)	0.87 (0.74 to 1.02)
Total work (hectojoules/kg)	37	5974	0.78 (0.46 to 1.32)	0.83 (0.34 to 1.98)
Fatigue index (%)	37	5974	0.97 (0.96 to 0.99)***	0.98 (0.96 to 1.00)
Aerobic fitness
$\stackrel{.}{V}O2\max$(ml/kg/min)	37	5974	0.97 (0.93 to 1.01)	0.93 (0.90 to 0.97)***
Riding style
Ball of foot (n=9)	19	4176	1.00	1.00
Toe-in-iron (n=2)	5	684	1.61 (0.99 to 2.61)	1.12 (0.60 to 2.08)
Full foot (n=3)	13	1114	2.56 (1.31 to 5.04)**	2.37 (1.46 to 3.85)***

The adjusted measures of muscular strength have also been adjusted for body mass.

*p<0.05; **p<0.01; ***p<0.001.

^†Adjusted for age and sex