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Frequency of low back pain (LBP) among twin individuals by sex and zygosity
| Sex/zygosity | Frequency of LBP, N (%) | |||
|---|---|---|---|---|
| No. | Monthly | Weekly | Total | |
| Monozygotic females | 472 (79.5) | 83 (14.0) | 39 (6.6) | 594 |
| Monozygotic males | 463 (74.0) | 107 (17.1) | 56 (9.0) | 626 |
| Dizygotic females | 442 (81.6) | 72 (13.3) | 28 (5.2) | 542 |
| Dizygotic males | 484 (74.0) | 117 (17.9) | 53 (8.1) | 654 |
| Opposite sex dizygotic | 916 (78.7) | 184 (15.8) | 64 (5.5) | 1,164 |
| Total | 2,777 (77.6) | 563 (15.7) | 240 (6.7) | 3,580 |
