Impact of HbA1c Measurement on Hospital Readmission Rates: Analysis of 70,000 Clinical Database Patient Records

Table 5

Coefficients of the interaction terms estimated from the final logistic regression model.

Attribute name	Value	Attribute name	Value	Estimate	𝑃-value
Age	[60, 100)		General Practice	0.061	0.732
			Internal Medicine	−0.018	0.910
			Missing	−0.112	0.446
			Other	−0.127	0.423
		Medical specialty	Surgery	−0.202	0.306
	<30		General Practice	−2.465	0.013
			Internal Medicine	−1.980	0.028
			Missing	−1.490	0.083
			Other*	−2.419	0.006
			Surgery	−2.715	0.041
Diagnosis	Circulatory	Discharge	Other	−0.073	0.510
	Digestive			−0.004	0.980
	Genitourinary			−0.188	0.235
	Injury			0.253	0.086
	Musculoskelet			0.325	0.057
	Neoplasms			−0.137	0.435
	Other			0.182	0.124
	Respiratory			0.079	0.540
Race	Caucasian	Discharge	Other	0.030	0.678
	Missing			0.320	0.087
	Other*			0.514	<0.001
Discharge		Time in hospital*		−0.030	0.001
Medical Specialty	General Practice	Discharge	Other	0.340	0.057
	Internal Medicine			0.211	0.199
	Missing			0.237	0.121
	Other			0.391	0.018
	Surgery*			0.733	0.000
Time in hospital		Medical Specialty	General Practice	−0.0591	0.023
			Internal Medicine	−0.0357	0.121
			Missing*	−0.0575	0.007
			Other	−0.0517	0.027
			Surgery*	−0.1179	0.000
Age	[60, 100)		General Practice	0.061	0.732
			Internal Medicine	−0.018	0.910
			Missing	−0.112	0.446
			Other	−0.127	0.423
		Medical specialty	Surgery	−0.202	0.306
	<30		General Practice	−2.465	0.013
			Internal Medicine	−1.980	0.028
			Missing	−1.490	0.083
			Other*	−2.419	0.006
			Surgery	−2.715	0.041
Time in hospital		Diagnosis	Circulatory	−0.036	0.032
			Digestive	−0.032	0.144
			Genitourinary	0.043	0.084
			Injury	−0.043	0.056
			Musculoskelet	0.020	0.457
			Neoplasms	−0.047	0.071
			Other*	−0.060	<0.001
			Respiratory	−0.009	0.651
	High, changed	Diagnosis	Circulatory^*a	0.573	<0.001
			Digestive	0.487	0.092
			Genitourinary	0.428	0.164
			Injury	−0.183	0.612
			Musculoskelet	0.754	0.037
			Neoplasms	0.122	0.806
			Other	0.305	0.129
			Respiratory^b	0.313	0.175
HbA1c	High, not changed		Circulatory^a	0.578	0.024
			Digestive	0.215	0.616
			Genitourinary	0.000	1.000
			Injury	0.316	0.517
			Musculoskelet	0.799	0.132
			Neoplasms	1.046	0.075
			Other	0.646	0.029
			Respiratory^b	0.435	0.191
	Normal		Circulatory^a	−0.066	0.694
			Digestive	0.010	0.965
			Genitourinary	0.189	0.441
			Injury	−0.595	0.020
			Musculoskelet	−0.100	0.719
			Neoplasms	0.362	0.215
			Other	−0.060	0.742
			Respiratory^b	−0.484	0.021

“Diagnosis” stands for a primary diagnosis with possible values: “circulatory” for icd9: 390–459, 785, “digestive”—icd9: 520–579, 787; “genitourinary”—icd9: 580–629, 788, “diabetes”—icd9: 250.xx, “injury” icd9: 800–999, “musculoskeletal”—icd9: 710–739; “neoplasms”—icd9: 140–239,“ respiratory” icd9: 460–519, 786, and “other” otherwise.
“HbA1c” variable has four values: “Not measured”, when the test was not measured, “Normal” if the test was measured and the result was normal, “High, changed” when the result of HbA1c test was high and diabetic mediations were changed, and “High, not changed” when the result of HbA1c test was high but diabetic mediations were not changed.
^aDenotes 𝑃 value less than 0.001 for a three degree of freedom test.
^bDenotes 𝑃 value equal to 0.02 for a three degree of freedom test.
*Denotes coefficients significant at the 0.01 significance level.