Table 1.

Bivariate analysis of the factors that influence knowledge score (n = 500).

Characteristics	n (%)	Mean (SD)	t	P
Demographic
Age		62.51 (9.96)	−0.167	<0.001a
Gender
Female	168 (33.60%)	44.46 (14.62)	−0.194	0.847
Male	332 (66.40%)	44.19 (14.42)
Marital status
Single (includes divorced, widowed, separated)	47 (9.40%)	45.49 (15.20)	−0.600	0.549
Married	453 (90.60%)	44.16 (14.41)
Education attainment
Less than junior high school	344 (68.80%)	40.25 (12.59)	9.654	<0.001
Senior high school/college/equivalent	156 (31.20%)	53.18 (14.42)
Employment
Agriculture	247 (49.40%)	39.85 (12.98)	–	<0.001b
Non-agriculture	247 (49.40%)	48.91 (14.39)
Unemployed	6 (1.2%)	36.33 (18.16)
Place of residence
Country	267 (53.40%)	40.73 (13.35)	6.074	<0.001c
City	233 (46.60%)	48.35 (14.67)
Self-reported income status
Good	61 (12.20%)	52.43 (14.23)	–	0.001b
Fair	356 (71.20%)	44.28 (13.87)
Poor	83 (16.60%)	38.29 (14.45)
Type of medical insurance
Government assisted	486 (97.20%)	44.39 (14.48)	0.954	0.341
Private or other	14 (2.80%)	40.64 (14.28)
Clinical
Family history of CHD
Yes	278 (55.60%)	44.09 (14.13)	−0.332	0.740
No	222 (44.40%)	44.52 (14.93)
Years diagnosed with CHD
4 or less	394 (78.8%)	43.93 (14.31)	−1.036	0.300
5 or more	106 (21.2%)	45.58 (15.06)
Comorbidities
Yes	275 (55.00%)	44.88 (15.07)	−1.021	0.308
No	225 (45.00%)	43.55 (13.71)
Numbers of hospitalization for CHD
1	124 (24.80%)	47.25 (15.20)	–	0.027b
2-3	258 (51.60%)	43.06 (13.94)
4 or more	118 (23.60%)	43.84 (14.52)

AbbreviationsCHD = coronary heart disease; a: Pearson correlation; b: analysis of variance; c: separate variance estimation t-test.