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Table 2 Multivariate factors associated with failed appointments with the corresponding odds ratios, confidence intervals, and p-values.

From: Predictors of failed attendances in a multi-specialty outpatient centre using electronic databases

Variable* OR 95% CI p-value
Age group    
   Up to 20 years 1   
   21 to 30 years (x1) 0.96 (0.83, 1.11) 0.575
   31 to 40 years (x2) 0.93 (0.81, 1.08) 0.335
   41 to 50 years (x3) 0.75 (0.64, 0.86) <0.001
   51 to 60 years (x4) 0.66 (0.57, 0.77) <0.001
   More than 60 years (x5) 0.84 (0.73, 0.97) 0.019
Race    
   Chinese 1   
   Malay (x6) 1.48 (1.31, 1.68) <0.001
   Indian (x7) 1.61 (1.42, 1.81) <0.001
   Others (x8) 1.03 (0.89, 1.18) 0.716
Days from scheduling to actual appointment    
   Up to 7 days 1   
   7 to 21 days (x9) 1.29 (1.16, 1.42) <0.001
   More than 21 days (x10) 2.38 (2.16, 2.62) <0.001
Percentage of previous failed appointments    
   Up to 20% 1   
   21% to 40% (x11) 0.96 (0.85, 1.09) 0.565
   41% to 60% (x12) 1.21 (1.07, 1.36) <0.001
   More than 60% (x13) 1.79 (1.60, 2.00) <0.001
   No previous appointment (x14) 4.38 (3.95, 4.86) <0.001
Provided cell phone number (x15) 0.10 (0.09, 0.11) <0.001
Approximate distance from TTSH    
   <6 km 1   
   6 to 14 km (x16) 1.02 (0.94, 1.11) 0.596
   >14 km (x17) 1.14 (1.04, 1.25) <0.001
Department    
   Surgical 1   
   Medical (x18) 0.92 (0.84, 0.99) 0.049
   ENT (x19) 1.2 (1.05, 1.37) 0.008
   Ophthalmology (x20) 1.13 (1.02, 1.26) 0.022
   Therapy (x21) 4.73 (3.85, 5.82) <0.001
   Others (x22) 20.22 (15.34, 26.65) <0.001
  1. * The indicator variables as used in the predicted probability equation in Figure 1 are shown in brackets () next to the respective variables.