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Table 3 The association between L4-S1 disk protrusion and lifetime cumulative lifting load in female participants

From: The roles of lumbar load thresholds in cumulative lifting exposure to predict disk protrusion in an Asian population

Lifetime cumulative lifting load (Newton-hr)nDisk protrusion at lower disk level (L45-S1)
AOR
Only lift load above 4000 N was includedLow02541
Intermediate0~ < 2.0 × 106240.7 (0.2–1.9)
High>  2.0 × 106232.6* (1.0–6.2)
Only lift load above 3400 N was includedLow02061
Intermediate0~ < 2.5 × 106471.6 (0.7–3.4)
High>  2.5 × 106481.9 (0.9–3.9)
Only lift load above 2800 N was includedLow01421
Intermediate0~ <  1.8 × 106791.9 (0.9–3.7)
High>  1.8 × 106802.7** (1.4–5.4)
lift load above 0 N was includedLow< 1.26 × 105991
Intermediate1.26 × 105 ~ < 5.6 × 1061012.0 (1.0–4.1)
High>  5.6 × 1061012.3* (1.1–4.8)
  1. Adjusted for age, BMI, smoking
  2. Statistically significant: *, P < .05; **, P < .01; ***, P < .001