Table 3

The DNS frequencies, RD and PRR in the control and illness groups (and subgroups of localised vs systemic illness) diagnosed in two time periods before the race

	Starters		DNS		RD (%) versus control*	p Value†	PRR versus control‡ (95% CI)	p Value§
	N	%	%	%	%
Control group (n=53,734)	43 425	80.8	10 309	19.2
Illness group (n=172)	134	77.9	38	22.1	−3.5 (−9.5 to 2.7)	0.2630	1.16 (0.89 to 1.52)	0.2693
Localised illness (n=101)	84	83.2	17	16.8	−2.0 (−9.4 to 5.4)	0.6046	0.87 (0.57 to 1.33)	0.5265
Systemic illness (n=71)	50	70.4	21	29.6	11.6 (1.1–22.2)	0.0309	1.59 (1.13 to 2.23)	0.0073
>24 hours before race (n=38)	32	84.2	6	15.8	−1.6 (−13.6 to 10.5)	0.8005	0.89 (0.46 to 1.74)	0.7403
<24 hours before race (n=33)	18	54.5	15	45.5	27.1 (10.4–43.8)	0.0015	2.38 (1.67 to 3.41)	<0.0001

*RD—adjusted for demographic variables: year of race, race type (21.1 km and 56 km), gender.
†p Value: pairwise versus control group for RD.
‡PRR—adjusted for demographic variables: year of race, race type (21.1 km and 56 km), gender.
§p Value: pairwise versus control group for PRR.
DNS, did-not-start; PRR, prevalence risk ratio; RD, risk difference.