Table 5. Estimates of helmet wearing effect (Yes vs. No) in multiple logistic regression analysis for close passing using various cut points.

Cut point	aOR	95% CI	p-value
0.5m*	–	–	–
0.75m+	1.01	0.33–3.11	0.993
1.0m	1.13	0.76–1.68	0.540
1.5m	1.21	1.02–1.44	0.028
2.0m	1.46	1.13–1.89	0.004

^*There were only two passing events less than 0.5 m. In each case, Walker did not wear a helmet.

+There were only 13 overtaking events less than 0.75 m. Close passing events occurred 0.6% and 0.5% of the time when wearing and not wearing a helmet respectively.