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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.