eTable 1.
Demographics and practice characteristics of March-April 2020 and July-August 2020 respondents
| Characteristic | March respondents (n = 171) | July respondents (n = 104) | P valueb |
|---|---|---|---|
| Age years, mean ± SD | 50 ± 11 | 52 ± 10 | 0.12 |
| 30-39, no. (%) | 35 (20) | 14 (13) | 0.06 |
| 40-49, no. (%) | 51 (30) | 21 (20) | |
| 50-59, no. (%) | 44 (26) | 43 (41) | |
| 60-69, no. (%) | 35 (20) | 23 (22) | |
| 70-79, no. (%) | 6 (4) | 3 (3) | |
| Sex, no. (% female) | 94 (55) | 54 (52) | 0.60 |
| Practice region,a no. (%) | 0.24 | ||
| Northeast | 34 (20) | 32 (31) | |
| Midwest | 31 (18) | 14 (13) | |
| South | 70 (41) | 35 (34) | |
| West | 35 (20) | 22 (22) | |
| Other US territories | 1 (1) | 1 (1) | |
| Practice type, no. (%) | 0.08 | ||
| Academic | 67 (39) | 39 (38) | |
| Private | 92 (54) | 56 (54) | |
| Other (including both academic and private) | 12 (7) | 9 (9) | |
| Patient location (%), mean ± SD | |||
| Primary state | 81 ± 28 | 87 ± 18 | 0.04c |
| Adjacent state | 16.5 ± 26 | 12 ± 17 | 0.08c |
| Other state | 2.5 ± 6.5 | 1.4 ± 2.5 | 0.05c |
| Pre-COVID-19 average daily patient volume per ophthalmologist, median (IQR) | 30 (24,35) | 30 (24,36) | 0.88c |
IQR, interquartile range; SD, standard deviation.
a
States grouped into regions using the US Census categorizations.
b
Using t-test or Fisher exact test.
c
Using unequal variance as indicated.