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Table 4 Multinomial regression analysis of olive oil and wine consumption in stone formers and non-stone formers

From: Relevance of Mediterranean diet and glucose metabolism for nephrolithiasis in obese subjects

  Score 1 <1 spoon/day Score 2 1-3 spoons/day Score 3 or 4 ≥4 spoons/day  
Olive oil     
Stone formers 6 (13.3) 28 (62.2) 11 (24.4)  
Non-stone formers 33 (7.5) 221 (50) 188 (42.6)  
OR 1 0.7 0.32  
95% CI   0.3-1.8 0.1–0.9  
p   0.46 0.036  
  Score 1 Score 2 Score 3 Score 4
  No consumption 1–2 glasses/week 3–7 glasses/week >7 glasses/week
Wine     
Stone formers 13 (30.2) 4 (9.3) 16 (37.2) 10 (23.3)
Non-stone formers 189 (42.9) 115 (26.1) 83 (18.8) 54 (12.2)
OR 1 0.51 2.8 2.7
95% CI   0.2–1.6 1.3–6.1 1.1–6.5
p   0.24 0.009 0.027
  1. Olive oil and wine consumption was quantified according to the criteria adopted by the MedScore questionnaire that attributed a score between 0 and 4 to these item. Due to the low patient number, the score 3 and 4 of olive oil consumption were taken together in this multinomial regression analysis.