Demographic information for participants and information regarding contact lens types and contact lens wear frequency
| Controls n=41 | Cases n=37 | Total n=78 | P value | |
| Patient demographics | ||||
| Male, n (%) | 12 (32) | 17 (46) | 0.128* | |
| Mean age, years (range) | 41.0 (20–73) | 39.5 (19–69) | 0.764† | |
| Age categories | ||||
| <24, n (%) | 12 (29) | 4 (11) | ||
| 25–39, n (%) | 8 (20) | 17 (46) | ||
| 40–54, n (%) | 9 (22) | 12 (32) | ||
| >55, n (%) | 12 (29) | 4 (11) | ||
| Controls n=40 (%)‡ | Cases n=36 (%)‡ | Total n=76 (%)‡ | |
| Contact lens type and wear frequency | |||
| SDD wear frequency n=25 (33%) | |||
| Daily wear | 5 (36) | 8 (73) | 13 (52) |
| Few times a week | 6 (43) | 1 (9) | 7 (28) |
| Few times a month to few times a year | 3 (21) | 2 (18.2) | 5 (20) |
| SMD wear frequency n=33 (43%) | |||
| Daily wear | 11 (69) | 13 (77) | 24 (73) |
| Few times a week | 5 (31) | 4 (24) | 9 (27) |
| Few times a month to few times a year | 0 | 0 | 0 |
| STWD wear frequency n=9 (12%) | |||
| Daily wear | 2 (67) | 4 (67) | 6 (67) |
| Few times a week | 1 (33) | 2 (33) | 3 (33) |
| Few times a month to few times a year | 0 | 0 | 0 |
| SEW frequency n=3 (4%) | |||
| Daily wear | 1 (50) | 1 (100) | 2 (67) |
| Few times a week | 1 (50) | 0 | 1 (33) |
| Few times a month to few times a year | 0 | 0 | 0 |
| RGP wear frequency n=6 (8%) | |||
| Daily wear | 3 (60) | 1 (100) | 4 (67) |
| Few times a week | 2 (40) | 0 | 2 (33) |
| Few times a month to few times a year | 0 | 0 | 0 |
*Not significantly different (Pearson χ2).
†Not significantly different (Mann-Whitney U test).
‡Two contact lens types unknown (one each from control and case group) and excluded in this analysis.
RGP, rigid gas permeable; SDD, soft daily disposable; SEW, soft extended wear; SMD, soft monthly disposable; STWD, soft 2-week disposable.