Table 1 Variables included in logistic regression to calculate propensity scores of observations in opium users and control groups, before and after matching

Hypertension

<0.001*

0.9

No

n = 341 (65.8%)

n = 1505 (52.8%)

n = 341 (65.8%)

n = 677 (65.3%)

Yes

n = 177 (34.2%)

n = 1343 (47.2%)

n = 177 (34.2%)

n = 359 (34.7%)

DM

<0.001*

1

No

n = 354 (68.3%)

n = 1623 (57%)

n = 354 (68.3%)

n = 708 (68.3%)

Yes

n = 164 (31.7%)

n = 1225 (43%)

n = 164 (31.7%)

n = 328 (31.7%)

Hyperlipidemia

<0.001*

0.73

No

n = 292 (56.4%)

n = 1306 (45.9%)

n = 292 (56.4%)

n = 573 (55.3%)

Yes

n = 226 (43.6%)

n = 1542 (54.1%)

n = 226 (43.6%)

n = 463 (44.7%)

FBS

106 (IQR: 93–136)

115 (IQR: 98–157)

< 0.001*

106 (IQR: 93–136)

111 (IQR: 96–137.5)

0.08

LDL

94 (IQR: 74–120.75)

101 (IQR: 79–122)

0.003*

94 (IQR: 74–120.75)

100 (IQR: 76–119)

0.38

Gender

< 0.001*

0.32

Female

n = 19 (3.7%)

n = 731 (25.7%)

n = 19 (3.7%)

n = 27 (2.6%)

Male

n = 499 (96.3%)

n = 2117 (74.3%)

n = 499 (96.3%)

n = 1009 (97.4%)

Age

58 (IQR: 52–65)

61 (IQR: 53–69)

<0.001*

58 (IQR: 52–65)

58 (IQR: 51–65.25)

0.96

Chronic smoking

<0.001*

0.66

No

n = 91 (17.6%)

n = 1758 (61.7%)

n = 91 (17.6%)

n = 193 (18.6%)

Yes

n = 427 (82.4%)

n = 1090 (38.3%)

n = 427 (82.4%)

n = 843 (81.4%)