How do patient demographics, time-related variables, reasons for cancellation, and clinical procedures affect frequency of same-day operating room surgery cancelation? A maximum likelihood method

Da’ar, Omar B.; Al-Mutairi, Talal

doi:10.1186/s12913-018-3247-y

Table 3 Probit Regression: Probability of frequency of cancelation

From: How do patient demographics, time-related variables, reasons for cancellation, and clinical procedures affect frequency of same-day operating room surgery cancelation? A maximum likelihood method

Probit regression			No. of obs = 357
			Wald chi2(34) = 42.48
			Prob > chi2 = 0.1509
Log pseudo likelihood = − 138.506			R² = 0.1674
Dependent variable (Frequency of cancelation: 1 = Once, 0 = More than once)	Coefficient	Robust std. Error	Z	P > z	[95% Conf. Interval]
A
Waiting time	(Reference is < 6 h)
Waiting time > 6 h	0.089	0.042	2.1	0.036***	0.006	0.171
Age	(reference = child)
Adult	0.018	0.437	0.04	0.967	−0.839	0.875
Session	(reference = Afternoon)
Morning session	0.605	0.278	2.17	0.030***	0.060	1.150
Gender	(reference = Female)
Male	0.558	0.265	2.11	0.035***	0.039	1.078
Residence	(reference = outside city)
Riyadh Resident	−0.049	0.255	−0.19	0.849	− 0.548	0.451
Nationality	(reference = non-Saudi)
Saudi	−1.805	0.566	−3.19	0.001***	−2.915	−0.695
Season	Winter (reference)
Fasting	1.045	0.599	1.74	0.081	−0.130	2.219
Summer	0.397	0.245	1.62	0.106	−0.084	0.877
Spring	0.642	0.255	2.52	0.012***	0.143	1.142
Fall/Autumn	0.350	0.263	1.33	0.183	−0.165	0.866
Marital status	Married (reference)
Single	0.012	0.237	0.05	0.96	−0.453	0.477
Divorced	−0.451	0.454	−0.99	0.321	−1.341	0.439
Widowed	−0.139	0.369	−0.38	0.707	−0.863	0.585
Unknown	−1.039	0.427	−2.43	0.015***	−1.877	−0.202
Constant	1.831	0.800	2.29	0.022	0.264	3.399
B
Eligibility	Saudi dependent (reference)
Others	−1.258	0.466	−2.7	0.007***	−2.172	−0.344
Saudi	−0.754	0.320	−2.36	0.018***	−1.381	−0.128
Employee	−1.432	0.619	−2.31	0.021***	−2.646	−0.219
Employee dependents	0.221	0.577	0.38	0.701	−0.910	1.353
Exceptions Saudi	−0.511	0.342	−1.49	0.135	− 1.182	0.160
Exceptions 7 diseases	−1.096	0.727	−1.51	0.132	−2.521	0.329
Ineligible/out-of-pocket	−1.301	0.691	−1.88	0.06***	−2.656	0.054
Procedure	Hernia (reference)
Others	−0.233	0.325	−0.72	0.472	−0.870	0.403
ECCE IOL	−0.019	0.447	−0.04	0.966	−0.895	0.857
Excision Sinus	0.000	(empty)
Lap Cholecystetomy	−0.571	0.455	−1.26	0.209	−1.463	0.321
Phaco IOL	−0.645	0.379	−1.7	0.089*	−1.388	0.098
S/R wisdom teeth	0.000	(empty)
Septoplasty	−0.602	0.583	−1.03	0.302	− 1.745	0.541
Tympanoplasty	0.000	(empty)
Reason for cancelation	Unwell on day of procedure (reference)
Others	0.046	0.256	0.18	0.857	− 0.456	0.548
Aspirin intake	0.604	0.523	1.15	0.248	−0.422	1.629
No O.R time	1.049	0.443	2.37	0.018***	0.180	1.917
Not fasting	0.000	(empty)
Not indicated	0.084	0.318	0.27	0.791	−0.538	0.707
Patient refusal	0.125	0.375	0.33	0.739	−0.610	0.859
Scheduling issues	−1.068	0.467	−2.29	0.022***	−1.984	−0.153
Uncontrolled blood pressure	−0.294	0.325	−0.91	0.365	− 0.931	0.343
Uncontrolled blood sugar	0.121	0.324	0.37	0.709	−0.515	0.757
Constant	1.831	0.800	2.29	0.022	0.264	3.399

Significant at ***p < 0.01; **p < .05
Significant at ***p < 0.01; **p < .05; *p < 0.1

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