Teschke et al. BMC Public Health 2012, 12:765 http://www.biomedcentral.com/1471-2458/12/765 Page 6 of 9 Table 5 Associations between whether helmet was worn and trip or personal characteristics, variables retained in adjusted analysis only, each variable on its own (unadjusted) and in multiple logistic regression (adjusted) Helmet worn Yes/No (% Yes/% No)* Unadjusted Odds Ratio Adjusted Odds Ratio (95% Confidence Interval) (95% Confidence Interval) City Vancouver Toronto Bike light turned on during trip No Yes Trip distance < 2 km 2 - < 5 km 5 - < 10 km 10 - < 20 km ≥ 20 km Bike type used on trip Mountain bike City bike Touring/road bike Racing bike Folding bike Hybrid Cruiser BMX bike Fixed gear Alcohol used in 6 hours prior to trip No Yes Sex Male Female Age 19 - 29 30 - 39 40 - 49 50 - 59 ≥ 60 Income < $15,000 $15,000 - 29,999 $30,000 - 49,999 $50,000 - 79,999 $80,000 - 119,999 ≥ $120,000 DK/Refuse 315/99 163/113 376/179 102/33 147/102 158/63 106/32 36/12 31/3 139/67 17/12 98/46 50/16 7/5 152/28 6/17 1/6 8/15 442/175 36/37 272/138 206/74 160/103 114/54 90/27 69/14 44/12 30/36 50/33 83/37 88/45 80/19 97/12 50/30 (76/24) (59/41) (68/32) (76/24) (59/41) (71/29) (77/23) (75/25) (91/9) (67/23) (59/41) (68/32) (76/24) (58/42) (84/16) (26/74) (14/86) (35/65) (72/28) (49/51) (66/34) (74/26) (61/39) (68/32) (77/23) (83/17) (79/21) (45/55) (60/40) (69/31) (69/31) (81/19) (89/11) (63/37) 1 (reference) 0.46 (0.33 – 0.64) 1 (reference) 1.45 (0.93 – 2.25) 1 (reference) 1.63 (1.10 – 2.41) 2.14 (1.34 – 3.44) 1.91 (0.94 – 3.85) 6.75 (2.01 – 22.7) 1 (reference) 0.66 (0.30 – 1.46) 1.01 (0.64 – 1.61) 1.45 (0.77 – 2.73) 0.65 (0.19 – 2.12) 2.58 (1.55 – 4.27) 0.17 (0.07 – 0.47) 0.07 (0.01 – 0.66) 0.25 (0.10 – 0.61) 1 (reference) 0.39 (0.24 – 0.64) 1 (reference) 1.33 (0.95 – 1.87) 1 (reference) 1.33 (0.88 – 2.01) 2.14 (1.29 – 3.53) 3.04 (1.62 – 5.68) 2.24 (1.27 – 4.45) 0.44 (0.24 – 0.81) 0.75 (0.42 – 1.33) 1.13 (0.66 – 1.92) 1 (reference) 2.11 (1.14 – 3.90) 4.00 (1.99 – 8.06) 0.89 (0.50 – 1.61) 1 (reference) 0.38 (0.25 – 0.57) 1 (reference) 2.02 (1.17 – 3.50) 1 (reference) 1.67 (1.05 – 2.65) 1.67 (0.96 – 2.89) 1.47 (0.65 – 3.34) 5.43 (1.42 – 20.8) 1 (reference) 0.82 (0.33 – 2.05) 1.11 (0.65 – 1.90) 1.22 (0.58 – 2.58) 0.84 (0.20 – 3.44) 2.08 (1.18 – 3.68) 0.15 (0.05 – 0.46) 0.15 (0.02 – 1.40) 0.42 (0.16 – 1.16) 1 (reference) 0.42 (0.23 – 0.78) 1 (reference) 1.62 (1.06 – 2.48) 1 (reference) 0.98 (0.59 – 1.63) 1.27 (0.67 – 2.40) 2.45 (1.12 – 5.35) 1.35 (0.58 – 3.17) 0.45 (0.22 – 0.92) 0.94 (0.48 – 1.83) 1.12 (0.61 – 2.07) 1 (reference) 1.67 (0.84 – 3.35) 2.28 (1.03 – 5.07) 0.84 (0.42 – 1.71)