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Table 3 Pooled estimates of SNC relative risk and 95% confidence intervals by subgroups within exposures to wood dust, leather dust, formaldehyde and textile industry (case-control studies)

From: Occupational exposure and sinonasal cancer: a systematic review and meta-analysis

Group/subgroup N of risk estimates/N of studies Pooled estimate(95% CI) p-value Exposure
By duration of exposure    0.001 Wood dust
<15 years 18/7 2.40 (1.34-4.31)   
≥15 years 39/7 9.19 (5.84-14.46)   
By duration of exposure    0,371 Leather dust
<15 years 7/3 7.44 (2.55-21.70)   
≥15 years* 13/4 13.30 (6.68-26.48)   
By level of exposure    0.664 Formaldehyde
low 6/2 1.38 (0.92-2.06)   
moderate/high 8/3 1.57 (1.00-2.48)   
By duration of exposure    0.10 Textile industry
<15 years 5/3 1.79 (1.12-2.87)   
≥15 years 8/3 3.31 (1.90-5.78)   
  1. *One of the included study reported risk estimates for duration of exposure ≥12 years.