Table 2. How the Age of Minors Was Determined From Government-Issued Photo Identification (ID).
| ID Method | % (95% CI) of Purchase Attemptsa | No. (%) of 201 Retailers Using ID Method 0-6 Times | ||||||
|---|---|---|---|---|---|---|---|---|
| 0 | 1 | 2 | 3 | 4 | 5 | 6 | ||
| Verified electronically | 34.5 (29.3-40.1) | 101 (50.2) | 7 (3.5) | 11 (5.5) | 16 (8.0) | 21 (10.4) | 24 (11.9) | 21 (10.4) |
| Looked at briefly | 23.0 (19.9-26.3) | 68 (33.8) | 56 (27.9) | 38 (18.9) | 21 (10.4) | 13 (6.5) | 3 (1.5) | 2 (1.0) |
| Other | 17.6 (14.4-21.4) | 100 (49.8) | 45 (22.4) | 22 (10.9) | 17 (8.5) | 6 (3.0) | 7 (3.5) | 4 (2.0) |
| Looked at carefully | 15.8 (13.2-18.9) | 104 (51.7) | 44 (21.9) | 29 (14.4) | 14 (7.0) | 7 (3.5) | 3 (1.5) | 0 |
| Compared with age calendar | 9.1 (7.1-11.7) | 135 (67.2) | 42 (20.9) | 11 (5.5) | 10 (5.0) | 2 (1.0) | 0 | 1 (0.5) |
a
The 95% CI uses a robust variance estimator for repeated measures within retailers.