Variable | Frequency (%) or mean±SD (median, minimum–maximum) | p Value | |
---|---|---|---|
Case (n=347) | Control (n=1735) | ||
Eye disorder-related visits/all visits over the 8-year period | 5609/74 583 (7.5) | 18 914/393 105 (4.8) | <0.001 |
Number of patients with eye disorder-related visits prior to the index date by time interval (year) | |||
Overall 0–8 | 325 (93.7) | 1414 (81.5) | <0.001 |
7–8 | 135 (38.9) | 559 (32.2) | 0.018 |
6–7 | 157 (45.3) | 643 (37.1) | 0.005 |
5–6 | 163 (47.0) | 695 (40.1) | 0.020 |
4–5 | 171 (49.3) | 680 (39.2) | <0.001 |
3–4 | 177 (51.0) | 676 (39.0) | <0.001 |
2–3 | 193 (55.6) | 744 (42.9) | <0.001 |
1–2 | 190 (54.8) | 745 (43.0) | <0.001 |
0–1 | 254 (73.2) | 754 (43.5) | <0.001 |
Number of eye disorder-related visits/patient prior to the index date by time interval (year) | |||
7–8 | 1.11±2.60 (0, 0–26) | 0.92±2.36 (0, 0–24) | 0.177 |
6–7 | 1.70±3.81 (0, 0–42) | 1.14±2.84 (0, 0–38) | 0.004 |
5–6 | 1.73±3.21 (0, 0–23) | 1.30±2.86 (0, 0–28) | 0.013 |
4–5 | 2.08±4.32 (0, 0–32) | 1.32±2.88 (0, 0–33) | <0.001 |
3–4 | 2.15±4.05 (1, 0–32) | 1.44±3.34 (0, 0–42) | 0.001 |
2–3 | 2.08±3.72 (1, 0–25) | 1.56±3.36 (0, 0–37) | 0.009 |
1–2 | 2.38±4.01 (1, 0–29) | 1.68±3.64 (0, 0–33) | 0.001 |
0–1 | 3.23±4.55 (2, 0–33) | 1.71±3.39 (0, 0–26) | <0.001 |
Urbanisation level of patient's residence* | |||
1 (most urbanised) | 109 (32.4) | 553 (32.8) | 0.208 |
2 | 117 (34.8) | 527 (31.3) | |
3 | 33 (9.8) | 240 (14.2) | |
4 | 42 (12.5) | 215 (12.8) | |
5 (least urbanised) | 35 (10.4) | 150 (8.9) | |
Tertile of insured amount* | |||
1 (lowest) | 100 (29.1) | 614 (35.8) | 0.016 |
2 | 112 (32.6) | 568 (33.1) | |
3 (highest) | 132 (38.4) | 535 (31.2) |
*Eleven cases and 50 controls had missing information on urbanisation levels and 3 cases and 18 controls had missing information on insured amount.