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Table 2 Odds ratio (OR) by study design.

From: Sparse conditional logistic regression for analyzing large-scale matched data from epidemiological studies: a simple algorithm

ATC class second level ATC class fourth level Case-crossover Matched case-control
Drugs for acid related disorders A02BA 1.88  
  A02BX 1.19  
Drugs for functional gastrointestinal disorders A03FA 1.24  
Laxatives A06AD 1.37  
Mineral supplements A12CC   1.10
  A12AX 1.57  
Antianemic preparations B03AA   1.20
  B03BB 1.24  
Peripheral vasodilators C04AX 1.15  
Antifungals for dermatological use D01AE 1.13  
Corticosteroids D07AB   1.16
Sex hormones and modulators of the genital system G03CA 1.20  
Muscle relaxants M03BX 1.23  
Analgesics N02BG   1.09
Antiepileptics N03AA 2.93  
  N03AF 1.34 2.11
  N03AX 1.19  
Psycholeptics N05BA   1.11
  N05CD 1.37 1.09
  N05CX 1.01 1.46
Psychoanaleptics N06AB   1.06
  N06AX 1.05 1.11
Drugs for obstructive airway diseases R03BB 1.23  
Cough and cold preparations R05DA 1.08  
Antihistamines for systemic use R06AX 1.06  
  1. Odds ratio estimates are displayed only for selected risk factors.