Table 1.
Prostate Cancer Care and Outcomes Study questionnaire completion rates by treatment and control groups
| Follow-up year | Participant category (type of treatment or control) (No who completed/Total No in group (%)) | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| AS/WW | NSRP | Non-NSRP | RP type unknown* | EBRT/HDR | ADT | LDR | Orchidectomy* | Primary treatment unknown* |
Total cases† | Controls‡ | |
| Baseline | 200/200 (100) | 494/494 (100) | 478/478 (100) | 9/9 (100) | 170/170 (100) | 227/227 (100) | 58/58 (100) | 4/4 (100) | 2/2 (100) | 1642/1642 (100) | 495/495 (100) |
| 1 | 190/200 (95) | 486/494 (98) | 470/478 (98) | 9/9 (100) | 165/170 (97) | 217/227 (96) | 57/58 (98) | 3/4 (75) | 2/2 (100) | 1599/1642 (97) | 458/495 (93) |
| 2 | 178/200 (89) | 472/494 (96) | 443/478 (93) | 9/9 (100) | 163/170 (96) | 204/227 (90) | 56/58 (97) | 3/4 (75) | 2/2 (100) | 1530/1642 (93) | 433/495 (87) |
| 3 | 175/200 (88) | 458/494 (93) | 439/478 (92) | 9/9 (100) | 153/170 (90) | 199/227 (88) | 56/58 (97) | 2/4 (50) | 2/2 (100) | 1493/1642 (91) | N/A |
| 5 | 160/200 (80) | 443/494 (90) | 424/478 (89) | 7/9 (78) | 142/170 (84) | 173/227 (76) | 51/58 (88) | 2/4 (50) | 2/2 (100) | 1404/1642 (86) | 386/495 (78) |
| 10 | 95/200 (48) | 307/494 (62) | 256/478 (54) | 4/9 (44) | 94/170 (55) | 88/227 (39) | 40/58 (69) | 0/4 | 0/2 | 884/1642 (54) | N/A |
| 15 | 53/200 (27) | 192/494 (39) | 141/478 (29) | 3/9 (33) | 43/170 (25) | 45/227 (20) | 25/58 (43) | 0/4 | 0/2 | 502/1642 (31) | 103/495 (21) |
ADT=androgen deprivation therapy with or without EBRT; AS/WW=active surveillance/watchful waiting; EBRT/HDR=external beam radiotherapy or high dose rate brachytherapy, or both; LDR=low dose rate brachytherapy; N/A=not applicable as controls did not complete follow-up during this year; non-NSRP=non-nerve sparing radical prostatectomy; NSRP=nerve sparing radical prostatectomy.
Excluded from multivariate regression analyses owing to low numbers.
Total participants include men who had treatment unknown, orchidectomy, and radical prostatectomy type unknown, who were excluded from the multivariate analysis.
35 controls who were diagnosed with prostate cancer after baseline were censored from their date of diagnosis.