Table 2.
Number of subjects in the cohort throughout the follow-up time. The table also shows crude data on the number of subjects receiving SL or DP of ≥ 90, ≥ 180 and ≥ 270 mean annual days, and mean annual days throughout the complete 10-year follow up time (-T5 to T5) in relation to gender for both SL and DP
| General population cohort | Exposed cohort | |||
|---|---|---|---|---|
| Non-surgical | Surgically treated once | Surgically treated ≥ 2 | ||
| n = 199 321 | n = 17 853 | n = 1645 | n = 436 | |
| Number of subjects in the study population | ||||
| -T5 to T1 | 199 321 | 17 853 | 1645 | 436 |
| T2 | 180 575 | 16 058 | 1576 | 425 |
| T3 | 161 469 | 14 238 | 1503 | 407 |
| T4 | 139 755 | 12 203 | 1393 | 380 |
| T5 | 119 629 | 10 346 | 1279 | 338 |
| Subjects with ≥ 90 mean annual days on SL | ||||
| -T5 | 6652 (3%) | 1044 (6%) | 133 (8%) | 30 (7%) |
| -T1 | 7926 (4%) | 1438 (8%) | 179 (11%) | 67 (15%) |
| T0 | 8360 (4%) | 1693 (9%) | 194 (12%) | 66 (15%) |
| T1 | 8515 (4%) | 1638 (9%) | 194 (12%) | 81 (19%) |
| T5 | 4930 (4%) | 743 (7%) | 126 (10%) | 34 (10%) |
| Subjects with ≥ 180 mean annual days on SL | ||||
| -T5 | 3727 (2%) | 590 (3%) | 81 (5%) | 24 (6%) |
| -T1 | 4388 (2%) | 877 (5%) | 110 (7%) | 42 (10%) |
| T0 | 4730 (2%) | 1081 (6%) | 124 (8%) | 50 (11%) |
| T1 | 4819 (2%) | 997 (6%) | 122 (7%) | 55 (13%) |
| T5 | 2732 (2%) | 451 (4%) | 86 (7%) | 15 (4%) |
| Subjects with ≥ 270 mean annual days on SL | ||||
| -T5 | 2064 (1%) | 326 (2%) | 44 (3%) | 9 (2%) |
| -T1 | 2450 (1%) | 527 (3%) | 65 (4%) | 26 (6%) |
| T0 | 2671 (1%) | 633 (4%) | 63 (4%) | 29 (7%) |
| T1 | 2736 (1%) | 612 (3%) | 75 (5%) | 35 (8%) |
| T5 | 1532 (1%) | 282 (3%) | 60 (5%) | 9 (3%) |
| Mean annual net days SL (-T5 to T5) | ||||
| Men | 6.6 days | 14.0 days | 20.4 days | 26.2 days |
| Women | 12.7 days | 23.8 days | 30.7 days | 38.5 days |
| Subjects with ≥ 90 mean annual days on DP | ||||
| -T5 | 10 030 (5%) | 1666 (9%) | 161 (10%) | 69 (17%) |
| -T1 | 12 694 (6%) | 2161 (12%) | 242 (15%) | 93 (21%) |
| T0 | 13 314 (7%) | 2288 (13%) | 262 (16%) | 99 (23%) |
| T1 | 13 890 (7%) | 2439 (14%) | 287 (17%) | 113 (26%) |
| T5 | 11 212 (9%) | 1993 (19%) | 279 (22%) | 110 (33%) |
| Subjects with ≥ 180 mean annual days on DP | ||||
| -T5 | 9010 (5%) | 1506 (8%) | 141 (9%) | 60 (15%) |
| -T1 | 11 424 (6%) | 1951 (11%) | 203 (12%) | 84 (19%) |
| T0 | 11 948 (6%) | 2057 (12%) | 228 (14%) | 89 (20%) |
| T1 | 12 485 (6%) | 2205 (12%) | 252 (15%) | 96 (22%) |
| T5 | 10 066 (8%) | 1802 (17%) | 256 (20%) | 99 (29%) |
| Subjects with ≥ 270 mean annual days on DP | ||||
| -T5 | 6929 (4%) | 1160 (7%) | 100 (6%) | 42 (10%) |
| -T1 | 8939 (4%) | 1529 (9%) | 158 (10%) | 57 (13%) |
| T0 | 9400 (5%) | 1616 (9%) | 169 (10%) | 62 (14%) |
| T1 | 9855 (5%) | 1748 (10%) | 193 (12%) | 66 (15%) |
| T5 | 7813 (7%) | 1422 (14%) | 198 (15%) | 77 (23%) |
| Mean annual net days DP (-T5 to T5) | ||||
| Men | 15.3 days | 27.9 days | 39.5 days | 53.8 days |
| Women | 22.8 days | 44.6 days | 49.5 days | 70.6 days |