TABLE 2—
Characteristics of Injuries in Public Bicycle Share Program Cities and Control Cities: North America, 2007–2012
| Preimplementation |
Postimplementation |
|||
| Characteristics | Nonhead Injuries, No. (%) | Head Injuries, No. (%) | Nonhead Injuries, No. (%) | Head Injuries, No. (%) |
| PBSP cities | ||||
| Total sample | 875 | 638 | 272 | 273 |
| Age, y | ||||
| < 15 | 246 (28.1) | 145 (22.7) | 55 (20.2) | 54 (19.8) |
| 15–24 | 115 (13.1) | 120 (18.8) | 30 (11.0) | 42 (15.4) |
| 25–49 | 274 (31.3) | 193 (30.3) | 112 (41.2) | 99 (36.3) |
| ≥ 50 | 203 (23.2) | 143 (22.4) | 63 (23.2) | 58 (21.3) |
| Unknown | 37 (4.2) | 37 (5.8) | 12 (4.4) | 20 (7.3) |
| Head injury severitya | ||||
| Mild | . . . | 169 (26.5) | . . . | 79 (29.4) |
| Moderate to severe | . . . | 324 (50.8) | . . . | 119 (44.2) |
| Unknown | . . . | 145 (22.7) | . . . | 71 (26.4) |
| Control cities | ||||
| Total sample | 1151 | 712 | 611 | 342 |
| Age, y | ||||
| < 15 | 185 (16.1) | 141 (19.8) | 80 (13.1) | 55 (16.1) |
| 15–24 | 268 (23.3) | 139 (19.5) | 158 (25.9) | 66 (19.3) |
| 25–49 | 402 (34.9) | 260 (36.5) | 229 (37.5) | 132 (38.6) |
| ≥ 50 | 251 (21.8) | 143 (20.1) | 115 (18.8) | 74 (21.6) |
| Unknown | 45 (3.9) | 29 (4.1) | 29 (4.8) | 15 (4.4) |
| Head injury severitya | ||||
| Mild | . . . | 132 (18.5) | . . . | 68 (19.9) |
| Moderate to severe | . . . | 361 (50.7) | . . . | 192 (56.1) |
| Unknown | . . . | 219 (30.8) | . . . | 82 (24.0) |
Note. PBSP = public bicycle share program. Preimplementation period consists of the 24 months before intervention date. Postimplementation period consists of a 12-month period following intervention. Intervention date was constructed for control cities to correspond with matched PBSP city. The PBSP cities were Montreal, QC; Washington, DC; Minneapolis, MN; Boston, MA; and Miami Beach, FL. The control cities were Vancouver, BC; New York, NY; Milwaukee, WI; Seattle, WA; and Los Angeles, CA. Percentages may not add to 100 because of rounding.
Injury severity groups were based on the abbreviated injury score (AIS) for the head-and-neck region: AIS < 3 was classified as mild and AIS ≥ 3 was classified as moderate to severe.