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Table 4 The multivariate logistic regression with number of teeth as the dependent variable and, linear trend over time (study year), age, marital status and social group as the independent variables

From: Trends in tooth loss in relation to socio-economic status among Swedish women, aged 38 and 50 years: repeated cross-sectional surveys 1968-2004

Independent variables P-value Odds ratio 95% confidence interval
Dependent variable: Number of teeth 1+ vs 0 teeth (Model I)
Linear trend over time <0.001 0.20 0.13-0.31
38 years old (reference)    
50 years old <0.001 4.79 2.73-8.43
Living together (reference)    
Single living 0.028 1.74 1.06-2.84
High social group (reference)    
Medium social group 0.051 7.42 0.99-55.45
Low social group 0.002 24.72 3.38-180.96
Dependent variable: Number of teeth 11+ vs 0–10 teeth (Model II)
Linear trend over time <0.001 0.21 0.15-0.28
38 years old (reference)    
50 years old <0.001 5.09 3.45-7.50
Living together (reference)    
Single living 0.004 1.74 1.20-2.52
High social group (reference)    
Medium social group 0.001 4.86 1.90-12.43
Low social group <0.001 11.57 4.58-29.35
Dependent variable: Number of teeth 21+ vs 0–20 teeth (Model III)
Linear trend over time <0.001 0.25 0.21-0.30
38 years old (reference)    
50 years old <0.001 4.94 3.72-6.55
Living together (reference)    
Single living 0.001 1.63 1.21-2.20
High social group (reference)    
Medium social group <0.001 2.92 1.78-4.80
Low social group <0.001 5.61 3.41-9.23
Dependent variable: Number of teeth 25+ vs 0–24 teeth (Model IV)
Linear trend over time <0.001 0.30 0.26-0.34
38 years old (reference)    
50 years old <0.001 4.39 3.42-5.63
Living together (reference)    
Single living 0.005 1.48 1.13-1.93
High social group (reference)    
Medium social group <0.001 2.13 1.47-3.10
Low social group <0.001 4.13 2.81-6.08