Table 1 Demographic characteristics and univariate factors associated with failed appointments, with the corresponding number of subjects (n), odds ratios, confidence intervals, and p-values (overall n = 22864).

Gender

   Male

12453 (54%)

1

   Female

10411 (46%)

0.94

(0.90, 0.99)

0.035

Race

   Chinese

16951 (74%)

1

   Malay

2073 (9%)

1.51

(1.38, 1.66)

<0.001

   Indian

2120 (9%)

1.73

(1.58, 1.90)

<0.001

   Others

1715 (8%)

1.42

(1.29, 1.57)

<0.001

Age group

   Up to 20 years

2002 (9%)

1

   21 to 30 years

4298 (19%)

0.99

(0.89, 1.10)

0.838

   31 to 40 years

4190 (18%)

0.97

(0.87, 1.08)

0.621

   41 to 50 years

3992 (17%)

0.76

(0.68, 0.84)

<0.001

   51 to 60 years

3265 (14%)

0.67

(0.60, 0.75)

<0.001

   More than 60 years

5137 (22%)

0.75

(0.68, 0.84)

<0.001

Days from scheduling to actual appointment

   Up to 7 days

5852 (26%)

1

   7 to 21 days

7234 (32%)

1.05

(0.98, 1.13)

0.144

   More than 21 days

9840 (43%)

1.24

(1.16, 1.33)

<0.001

Percentage of previous failed appointments

   Up to 20%

5288 (23%)

1

   21% to 40%

3584 (16%)

1.14

(1.04, 1.25)

0.007

   41% to 60%

3596 (16%)

1.41

(1.29, 1.55)

<0.001

   More than 60%

4414 (19%)

1.95

(1.79, 2.13)

<0.001

   No previous appointment

6044 (26%)

4.67

(4.31, 5.06)

<0.001

Provided cell phone number

13813 (60%)

0.09

(0.09, 0.10)

<0.001

Approximate distance from TTSH

   <6 km

8114 (37%)

1

   6 to 14 km

8427 (39%)

0.99

(0.93, 1.06)

0.844

   >14 km

5248 (24%)

1.11

(1.04, 1.20)

0.003

Admitted

   During appointment date

182 (1%)

0.86

(0.63, 1.16)

0.320

   Between appointment scheduling date and actual appointment date

423 (2%)

0.87

(0.71, 1.07)

0.183

Department

   Surgical

7961 (37%)

1

   Medical

6848 (32%)

1.06

(0.99, 1.13)

0.106

   ENT

1935 (9%)

1.14

(1.03, 1.27)

0.014

   Ophthalmology

3721 (17%)

1.13

(1.04, 1.23)

0.004

   Therapy

613 (3%)

2.64

(2.23, 3.11)

<0.001

   Others

574 (3%)

13.4

(10.49, 17.11)

<0.001