Table 3.

Mean (SD) of variables from the standard 12-lead resting electrocardiogram (ECG) in three different age groups for heart-healthy females.

Resting ECG without remark	< 50 years (n = 19)	50–65 years (n = 19)	> 65 years (n = 26)
Heart rate (beats/min)	64 (11)	67 (10)	68 (11)*
PQ-time (ms)	153 (26)†	174 (36)*†	170 (22)*†
QRS duration (ms)	87 (10)†	87 (11)†	78 (13)†
QT-time (ms)	383 (26)	388 (48)	389 (28)
QTc (ms)	392 (29)	408 (41)*	412 (26)*
P-wave duration (ms)	84 (20)†	93 (15)*†	92 (15)*†
P-wave amplitude (mV)	0.19 (0.07)	0.16 (0.05)	0.16 (0.04)
R+S (mV)	2.2 (0.5)†	2.3 (0.6)†	2.4 (0.6)†

^*P < 0.05 compared with <50 years.

^†P < 0.05 compared with males.