Table 2 The association between L4-S1 disk protrusion and lifetime cumulative lifting load in male participants
Lifetime cumulative lifting load (Newton-hr) | n | Disk protrusion at lower disk level (L4-S1) | ||
|---|---|---|---|---|
AOR | ||||
Only lift load above 4000 N was included | Low | 0 | 137 | 1 |
Intermediate | 0~ < 4.0 × 106 | 58 | 1.6 (0.8–3.1) | |
High | > 4 × 106 | 57 | 1.9 (1.0–3.8) | |
Only lift load above 3400 N was included | Low | 0 | 96 | 1 |
Intermediate | 0~ < 4.0 × 106 | 73 | 1.6 (0.8–3.3) | |
High | > 4 × 106 | 83 | 2.0* (1.0–3.9) | |
Only lift load above 3000 N was included | Low | < 2.5 × 105 | 84 | 1 |
Intermediate | 2.5 × 105 ~ < 5.6 × 106 | 83 | 2.9*** (1.4–6.2) | |
High | >  5.6 × 106 | 85 | 3.1** (1.5–6.7) | |
lift load above 0 N was included | Low | <  1.8 × 106 | 83 | 1 |
Intermediate | 1.8 × 106~ <  1.6 × 107 | 84 | 2.3* (1.2–4.9) | |
High | >  1.6 × 107 | 85 | 2.0 (1.0–4.2) | |