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).

Variable	n (%)	OR	95% CI	p-value
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