The best QT correction formula in a non-hospitalized population: the Fasa PERSIAN cohort study

Table 4 Determination of the lowest beta coefficient to find the best correction formula among previously published formulas by linear regression analysis of QTc and RR according to both genders

QTc formulas	B for RR	95% CI	Constant (ms)	95% CI (ms)	R²
Male
QTcB	− 0.073	− 0.080 to − 0.066	488.42	481.79 to 495.058	0.119
QTcFri	0.001	− 0.006 to 0.008	413.41	406.86 to 419.96	< 0.001
QTcFra	− 0.10	− 0.017 to 0.003	423.42	416.98 to 429.87	0.003
QTcH	0.022	0.015 to 0.029	393.68	387.22 to 400.13	0.013
QTcR	− 0.041	− 0.048 to 0.034	460.42	453.98 to 466.87	0.043
QTcD	− 0.034	− 0.041 to − 0.027	448.99	442.41 to 455.58	0.029
Female
QTcB	− 0.069	− 0.077 to − 0.061	495.97	489.30 to 502.64	0.066
QTcFri	0.016	0.008 to 0.024	410.71	404.01 to 417.40	0.004
QTcFra	0.019	0.012 to 0.027	408.09	401.86 to 414.31	0.006
QTcH	0.016	0.009 to 0.023	409.04	402.90 to 415.18	0.004
QTcR	− 0.012	− 0.020 to 0.004	439.20	432.82 to 445.58	0.002
QTcD	− 0.023	− 0.031 to − 0.015	450.40	443.82 to 456.99	0.008

QTc corrected QT interval, RR RR interval, 95% CI 95% confidence interval, ms milliseconds, Bazett’s correction formula (QTcB), Fridericia’s correction formula (QTcFri), Dmitrienko’s correction formula (QTcD), Framingham’s correction formula (QTcFra), Hodges’s correction formula (QTcH), Rautaharju’s correction formula (QTcR)

ISSN: 1471-2261