Research Article
Use of Chinese Medicine and Subsequent Surgery in Women with Uterine Fibroid: A Retrospective Cohort Study
Table 3
Incidence and relative incidence of surgery for CM users and nonusers.
| | CM nonusers | CM users |
IRRb |
(95% CI) | | Patients with surgery | Person-years |
IRa | Patients with surgery | Person-years |
IR |
| Overall | 2074 | 19994 | 103.73 | 1607 | 90744 | 17.71 | 0.17 | (0.16–0.18)*** | Age, years | | | | | | | | | <20 | 0 | 144 | 0.00 | 0 | 843 | 0.00 | — | | 20–29 | 66 | 1578 | 41.83 | 84 | 8849 | 9.49 | 0.23 | (0.16–0.31)*** | 30–39 | 509 | 5390 | 94.43 | 636 | 26484 | 24.01 | 0.25 | (0.23–0.29)*** | 40–49 | 1281 | 9488 | 135.01 | 807 | 41316 | 19.53 | 0.14 | (0.13–0.16)*** | ≥50 | 218 | 3394 | 64.23 | 80 | 13252 | 6.04 | 0.09 | (0.07–0.12)*** | Income, US$ per month | | | | | | | | | <564.3 | 516 | 5401 | 95.54 | 406 | 24169 | 16.80 | 0.18 | (0.15–0.20)*** | 564.3–656.5 | 415 | 3854 | 107.68 | 334 | 18075 | 18.48 | 0.17 | (0.15–0.20)*** | 656.6–779.6 | 671 | 5268 | 127.37 | 469 | 26095 | 17.97 | 0.14 | (0.13–0.16)*** | ≥779.7 | 472 | 5470 | 86.29 | 398 | 22406 | 17.76 | 0.21 | (0.18–0.24)*** | Occupational status | | | | | | | | | White collar | 1094 | 11524 | 94.93 | 899 | 52095 | 17.26 | 0.18 | (0.17–0.20)*** | Blue collar | 779 | 6078 | 128.17 | 559 | 29825 | 18.74 | 0.15 | (0.13–0.16)*** | Others | 201 | 2392 | 84.03 | 149 | 8824 | 16.89 | 0.20 | (0.16–0.25)*** | Area | | | | | | | | | Northern Taiwan | 946 | 11161 | 84.76 | 618 | 41349 | 14.95 | 0.18 | (0.16–0.20)*** | Central Taiwan | 361 | 2137 | 168.93 | 368 | 17166 | 21.44 | 0.13 | (0.11–0.15)*** | Southern Taiwan | 682 | 5759 | 118.42 | 549 | 28345 | 19.37 | 0.16 | (0.15–0.18)*** | Eastern Taiwan and offshore islands | 85 | 935 | 90.91 | 72 | 3884 | 18.54 | 0.20 | (0.15–0.28)*** | Comorbidity | | | | | | | | | Excessive menstruation | | | | | | | | | No | 1653 | 16616 | 99.48 | 1056 | 71005 | 14.87 | 0.15 | (0.14–0.16)*** | Yes | 421 | 3378 | 124.63 | 551 | 19739 | 27.91 | 0.22 | (0.20–0.25)*** | Iron-deficiency anemia | | | | | | | | | No | 1800 | 18054 | 99.70 | 1225 | 79864 | 15.34 | 0.15 | (0.14–0.17)*** | Yes | 274 | 1940 | 141.24 | 382 | 10880 | 35.11 | 0.25 | (0.21–0.29)*** | Dysmenorrhea | | | | | | | | | No | 1776 | 17481 | 101.60 | 1072 | 72183 | 14.85 | 0.15 | (0.14–0.16)*** | Yes | 298 | 2512 | 118.63 | 535 | 18562 | 28.82 | 0.24 | (0.21–0.28)*** | Infertility | | | | | | | | | No | 2072 | 19929 | 103.97 | 1592 | 90011 | 17.69 | 0.17 | (0.16–0.18)*** | Yes | 2 | 65 | 30.77 | 15 | 733 | 20.46 | 0.67 | (0.15–2.91) |
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aIR: incidence rate per 1,000 people.
bIRR: incidence rate ratio, compared to CM nonusers.
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