Table 5.

Calculated QT Interval According to Four Formulas in Different Heart Rate Groups

Groups	Measured QT (ms) (range)	QTBazett (ms) (range)	QTFridericia (ms) (range)	QTFramingham (ms) (range)	QTNomogram (ms) (range)
Group I	395 ± 25	373 ± 26	380 ± 25	375 ± 27	386 ± 24
	(360–420)	(340–409)	(352–412)	(342–412)	(354–414)
Group II	357 ± 26	421 ± 28	398 ± 25	399 ± 23	389 ± 23
	(260–420)	(330–503)	(305–466)	(318–456)	(311–452)
Group III	326 ± 27	434 ± 32	394 ± 31	392 ± 27	391 ± 26
	(240–380)	(326–514)	(294–465)	(310–450)	(313–452)
Group IV	307 ± 22	447 ± 30	394 ± 27	388 ± 22	395 ± 23
	(260–340)	(373–510)	(331–445)	(339–425)	(344–451)

Groups are same with Table 3.