Skip to main content

Table 4 Original and imputed admission characteristics and associations with treatment delay in univariate analyses (n = 1017)

From: Exploring the treatment delay in the care of patients with ST-elevation myocardial infarction undergoing acute percutaneous coronary intervention: a cross-sectional study

Variable

Missing (%)

Value

Imputed value

p-value*

Time from chest pain to ECG (median (IQR) minutes)

321 (31.6 %)

78 (41–148)

81 (20–142)

0.12

Treatment delay (median (IQR) minutes from ECG to PCI)

139 (13.7 %)

64 (51–84)

64 (47–82)

N/A

First ECG

143 (14.1 %)

  

<0.001

- General practitioner

 

25 (2.9 %)

34 (3.3 %)

 

- Ambulance

 

707 (80.9 %)

809 (79.6 %)

 

- Hospital

 

142 (16.2 %)

174 (17.1 %)

 

Weekend presentation

0 (0 %)

291 (28.6 %)

291 (28.6 %)

0.92

Weekday evening presentation

152 (14.9 %)

385 (44.5 %)

450 (44.2 %)

0.15

Month of discharge

0 (0 %)

N/A

N/A

0.72

Interhospital transfer for PCI

8 (0.8 %)

199 (19.7 %)

200 (19.7 %)

<0.001

Systolic blood pressure on admission (mean (SD) mmHg)

45 (4.4 %)

130 (26)

130 (27)

0.82

Heart rate on admission (mean (SD) beats/min)

161 (15.8 %)

75 (18)

75 (18)

0.48

Resuscitation

1 (0.1 %)

99 (9.7 %)

99 (9.7 %)

0.31

Acute heart failure on admission

54 (5.3 %)

47 (4.9 %)

58 (5.7 %)

<0.001

Cardiogenic shock on admission

71 (7.0 %)

37 (3.9 %)

46 (4.5 %)

0.06

Creatinine level on admission (median (IQR) mmol/L)

112 (11.0 %)

78 (66–91)

77.8 (65.0–90.6)

0.03

Nr of diseased vessels

22 (2.2 %)

  

0.56

- One

 

555 (55.8 %)

566 (55.7 %)

 

- Two

 

264 (26.5 %)

269 (26.4 %)

 

- Three

 

176 (17.7 %)

182 (17.9 %)

 

Location stenosesa

    

- Left main

7 (0.7 %)

27 (2.7 %)

27 (2.7 %)

0.20

- Right coronary

6 (0.6 %)

565 (55.9 %)

569 (55.9 %)

0.10

- Left anterior descending

5 (0.5 %)

648 (64.0 %)

652 (64.1 %)

0.03

- Circumflex

7 (0.7 %)

400 (39.6 %)

405 (39.8 %)

0.06

  1. Significant results are highlighted in bold
  2. ECG electrocardiogram, IQR interquartile range, PCI percutaneous coronary intervention, N/A not applicable, SD standard deviation, mmHg millimeter of mercury, mmol/L millimoles per litre
  3. *P-values are calculated using the Wald statistics, comparing a generalized linear model with and without the imputed variable, corrected for clustering of patients in PCI centers
  4. aOnly stenoses ≥50 %. A single patient can have more than one stenosis