. 2018 Nov 12;17(1):107–118. doi: 10.5217/ir.2018.00099

Table 3.

Regression Coefficients of Variables Used in Multiple Linear Regression

Independent variable (reference)	Dependent variable
Independent variable (reference)	SIBDQ	SF-36 PCS	SF-36 MCS	EQ-5D-3L	VAS
Age	0.134	0.060	0.281^a	−0.001	−0.272^a
Sex (male)
Female	−0.465	−3.462	−4.025	−0.050	−5.087
Race (non-Chinese)
Chinese	0.092	0.731	1.464	0.017	−1.951
Educational level (secondary/below)
Tertiary/above	0.596	1.750	3.362	0.077	0.190
Employment status (unemployed/students/unable to work)
Employed	3.831	5.552	9.738^a	0.104^a	1.275
Monthly income status (<$3,000)
≥$3,000	−0.855	−1.747	−1.217	−0.031	−0.716
Housing type (private residence)
Public residence	−3.230	−8.070^a	−3.238	−0.018	−9.207^b
Marital status (single/widowed/divorced)
Married	0.877	−0.324	1.631	0.036	2.224
Smoking status (non-/former smoker)
Smoker	2.777	6.809	1.513	0.099	−0.522
Charlson Comorbidity Index	−0.491	−4.531^a	−0.585	0.016	1.248
Disease duration	0.060	0.105	0.160	0.002	0.160
Disease activity (remission)
Active disease	−6.293^c	−9.409^b	−9.743^b	−0.051	−7.254^a
5-Aminosalicylates (no)
Yes	−0.369	−1.010	−1.478	−0.044	−0.020
Immunomodulators (no)
Yes	−1.456	−2.412	−5.535	−0.050	−3.784
Corticosteroids (no)
Yes	−7.392^c	−10.390^b	−8.827^a	−0.053	−2.428
Biologics (no)
Yes	0.143	−2.960	−5.094	−0.051	−2.918
Medication adherence (low–MARS <20)
High–MARS ≥20	4.049^a	4.470	1.320^c	0.039	8.961^b
Extraintestinal manifestation (absent)
Present	−3.456	−13.381^a	1.023	−0.062	1.930
Hospitalizations over 1 yr	0.296	0.419	0.944	0.022	0.070

Statistical significance: ^aP<0.05, ^bP<0.01, ^cP<0.001.

SIBDQ, short IBD questionnaire; SF-36 PCS, physical component summary of Short Form-36; SF-36 MCS, mental component summary of Short Form-36; EQ-5D-3L, EuroQol 5-dimensions 3-levels; VAS, visual analogue scale of EuroQol-5D; MARS, Medication Adherence Report Scale.