Table 1.
Injury rates, rate ratios and 95 % confidence intervals, and injury rate model estimate
| Year | Number of injuriesN (%) | Number of hired workers, ranchers, and farm operators | Injury rate per 100,000 hired workers, ranchers, and farm operators (95 % CI) | Rate ratios (95 % CI) |
|---|---|---|---|---|
| 2005 | 63 (5.09) | 206,640 | 30.49 (22.72, 38.26) | 1.00 (Ref.) |
| 2006 | 95 (7.67) | 207,316 | 45.82 (36.37, 55.28) | 1.50 (1.09, 2.07) |
| 2007 | 97 (7.84) | 207,992 | 46.64 (37.12, 56.16) | 1.53 (1.11, 2.10) |
| 2008 | 148 (11.95) | 208,669 | 70.93 (59.26, 82.59) | 2.33 (1.73, 3.12) |
| 2009 | 174 (14.05) | 209,345 | 83.12 (70.53, 95.70) | 2.73 (2.04, 3.64) |
| 2010 | 149 (12.04) | 210,021 | 70.95 (59.32, 82.57) | 2.33 (1.73, 3.12) |
| 2011 | 160 (12.92) | 210,697 | 75.94 (63.94, 87.94) | 2.49 (1.86, 3.33) |
| 2012 | 176 (14.22) | 211,373 | 83.27 (70.73, 95.80) | 2.73 (2.05, 3.64) |
| 2013 | 176 (14.22) | 212,050 | 83.00 (70.51, 95.49) | 2.72 (2.04, 3.63) |
| All | 1238 (100) |
Regression estimate β for injury rate model (e β)
β= 0.1065 (e β =1.11); p-value <0.0001