Table 4.
Weapon-related details and circadian bins
| Circadian bin | |||||||
|---|---|---|---|---|---|---|---|
| (00:01–04:00) (N=270) | (04:01–08:00) (N=190) | (08:01–12:00) (N=353) | (12:01–16:00) (N=378) | (16:01–20:00) (N=491) | (20:01–00:00) (N=454) | p | |
| Firearm type | N (%) | N (%) | N (%) | N (%) | N (%) | N (%) | .20 |
| Handgun | 176 (65.2) | 128 (67.4) | 235 (66.6) | 267 (70.6) | 342 (69.7) | 324 (71.4) | |
| Shotgun | 38 (14.1) | 26 (13.7) | 53 (15.0) | 64 (16.9) | 74 (15.1) | 67 (14.8) | |
| Rifle | 49 (18.1) | 32 (16.8) | 59 (16.7) | 43 (11.4) | 67 (13.6) | 55 (12.1) | |
| Other | 1 (0.4) | 1 (0.5) | 3 (0.8) | 1 (0.3) | 1 (0.2) | 0 (0.0) | |
| Combination | 0 (0.0) | 1 (0.5) | 0 (0.0) | 0 (0.0) | 0 (0.0) | 0 (0.0) | |
| Not reported | 0 (0.0) | 0 (0.0) | 0 (0.0) | 0 (0.0) | 0 (0.0) | 0 (0.0) | |
| Unknown | 6 (2.2) | 2 (1.1) | 3 (0.8) | 3 (0.8) | 7 (1.4) | 8 (1.8) | |
| Firearm caliber | N=187 | N=143 | N=266 | N=273 | N=345 | N=336 | .26 |
| Mean (SD) (in) | .33 (.08) | .34 (.08) | .33 (.08) | .34 (.07) | .34 (.07) | .34 (.07) | |
| Median (IQR) (in) | .35 (.16) | .36 (.11) | .36 (.16) | .36 (.09) | .36 (.10) | .36 (.08) | |
| Range (in) | .22–.50 | .22–.54 | .22–.50 | .22–.46 | .17–.45 | .22–.50 | |
| Stolen firearm | .54 | ||||||
| No | 36 (13.3) | 35 (18.4) | 48 (13.6) | 44 (11.6) | 58 (11.8) | 55 (12.1) | |
| Yes | 1 (0.4) | 1 (0.5) | 2 (0.6) | 2 (0.5) | 3 (0.6) | 0 (0.0) | |
| Not applicable | 7 (2.6) | 2 (1.1) | 6 (1.7) | 10 (2.6) | 10 (2.0) | 14 (3.1) | |
| Unknown | 226 (83.7) | 152 (80.0) | 297 (84.1) | 322 (85.2) | 420 (85.6) | 385 (84.8) | |
| Stored gun locked | .66 | ||||||
| Not locked | 0 (0.0) | 2 (1.1) | 5 (1.4) | 1 (0.3) | 4 (0.8) | 4 (0.9) | |
| Locked | 2 (0.7) | 0 (0.0) | 2 (0.6) | 3 (0.8) | 3 (0.6) | 3 (0.7) | |
| Other | 0 (0.0) | 0 (0.0) | 0 (0.0) | 0 (0.0) | 0 (0.0) | 1 (0.2) | |
| Not applicable | 64 (23.7) | 51 (26.8) | 74 (21.0) | 89 (23.5) | 113 (23.0) | 107 (23.6) | |
| Unknown | 204 (75.5) | 137 (72.1) | 272 (77.1) | 285 (75.4) | 371 (75.5) | 339 (74.6) | |
| Stored gun loaded | .28 | ||||||
| Unloaded | 0 (0.0) | 0 (0.0) | 3 (0.8) | 2 (0.5) | 0 (0.0) | 4 (0.9) | |
| Loaded | 0 (0.0) | 1 (0.5) | 2 (0.6) | 0 (0.0) | 1 (0.2) | 2 (0.4) | |
| Not applicable | 63 (23.3) | 51 (26.8) | 72 (20.4) | 89 (23.5) | 113 (23.0) | 107 (23.6) | |
| Unknown | 207 (76.6) | 138 (72.6) | 276 (78.2) | 287 (75.9) | 377 (76.7) | 341 (75.1) | |
| Gun owner | .04 | ||||||
| Shooter | 30 (11.1) | 15 (7.9) | 39 (11.0) | 29 (7.7) | 45 (9.2) | 36 (7.9) | |
| Parent | 5 (1.9) | 1 (0.5) | 5 (1.4) | 2 (0.5) | 5 (1.0) | 1 (0.2) | |
| Other family member | 2 (0.7) | 2 (1.1) | 9 (2.5) | 5 (1.3) | 2 (0.4) | 9 (2.0) | |
| Friend/acquaintance | 4 (1.5) | 6 (3.2) | 6 (1.7) | 6 (1.6) | 4 (0.8) | 11 (2.4) | |
| Stranger | 1 (0.4) | 0 (0.0) | 0 (0.0) | 0 (0.0) | 1 (0.2) | 0 (0.0) | |
| Other | 0 (0.0) | 0 (0.0) | 1 (0.3) | 1 (0.3) | 7 (1.4) | 3 (0.7) | |
| Unknown | 228 (84.5) | 166 (87.4) | 293 (83.0) | 335 (88.6) | 427 (87.0) | 394 (86.8) | |
Cochran-Mantel-Haenszel statistics used for categorical variables (row mean scores differ for the general association statistic for the circadian bin); ANOVAs used for the continuous variable (caliber)