Men | Women | ||||||
MZ | DZsame-sex | DZopposite-sex | MZ | DZsame-sex | DZopposite-sex | ||
Subjects | No | 2608 | 2731 | 1725 | 3384 | 3886 | 1773 |
Mean age | Years (95% CI) | 35 (35 to 35) | 37 (37 to 37) | 37 (36 to 37) | 35 (35 to 35) | 37 (37 to 37) | 37 (37 to 37) |
No LBP or NSP | % (95% CI) | 69 (67 to 70) | 68 (67 to 70) | 67 (65 to 70) | 57 (56 to 59) | 56 (55 to 58) | 54 (52 to 56) |
Solely LBP | 12 (11 to 13) | 12 (10 to 13) | 11 (10 to 13) | 9 (8 to 10) | 10 (9 to 11) | 11 (10 to 12) | |
Solely NSP | 12 (11 to 14) | 13 (11 to 14) | 13 (11 to 14) | 20 (19 to 21) | 20 (19 to 21) | 21 (19 to 23) | |
Concurrent LBP and NSP | 7 (6 to 8) | 7 (6 to 8) | 8 (7 to 10) | 13 (12 to 14) | 14 (13 to 15) | 14 (12 to 15) | |
Low physical workload | % (95% CI) | 52 (50 to 54) | 50 (49 to 52) | 53 (50 to 55) | 58 (56 to 59) | 57 (56 to 59) | 57 (55 to 60) |
High physical workload | 48 (46 to 50) | 50 (48 to 51) | 47 (45 to 50) | 42 (41 to 44) | 43 (41 to 44) | 43 (40 to 45) | |
Mean exposure duration | Years (95% CI) | 10 (10 to 11) | 12 (12 to 12) | 12 (11 to 12) | 10 (10 to 10) | 11 (11 to 12) | 11 (11 to 12) |
Stratified by sex, and zygosity (monozygotic, same-sex dizygotic (DZ), opposite-sex DZ).
LBP, low back pain; NSP, neck–shoulder pain.