. 2003 Aug 18;7(5):R101–R107. doi: 10.1186/cc2345

Table 3.

Relationship between dichotomised variables, based on measurements of initial electrocardiography and 'arrhythmia'

	Cases (%)(n = 39)	Controls (%)(n = 117)	Odds ratio (95% confidence interval)	Adjusted odds ratio (95% confidence interval)
Heart rate > 100 beats/min	64	51	1.68 (0.80–3.52)	1.44 (0.65–3.18)^a
QRS ≥ 100 ms	82	76	1.47 (0.57–3.79)	0.87 (0.31–2.47)^b
QRS >120 ms	28	9	3.56 (1.46–8.68)	2.02 (0.66–6.17)^b
QRS ≥ 160 ms	13	2	14 (1.52–129)	5.42 (0.50–59)^b
QT > 400 ms	38	35	1.17 (0.54–2.51)	0.57 (0.23–1.43)^a
QTc > 500	74	50	3.07 (1.33–7.07)	1.48 (0.57–3.87)^a
R wave in aVR > 3 mm	56	29	33 (3.17–921)^c	13.0 (1.64–102)^a
R/S ratio in aVR > 0.7	28	3	16 (3.47–74)	8.88 (1.73–45)^a
QT dispersion > 60 ms	79	62	2.67 (1.03–6.91)	1.50 (0.56–4.00)^a

^aAdjusted for QRS. ^bAdjusted for QTc. ^cExact confidence interval.