Table 12

QRS axis distributed by age and gender

Age (years)	QRS axis (°)
	Male	Female
	Median	Mean	SD	98%	2%	Total	Median	Mean	SD	98%	2%	Total
<20	78.00	72.50	36.93	125.52	0.32	67	75.00	68.61	35.58	110.68	−33.40	59
20–29	69.00	60.69	32.34	112.00	−20.00	251	70.00	65.17	27.55	111.70	−16.90	306
30–39	55.50	49.70	34.41	100.06	−30.08	400	60.00	55.91	29.19	101.00	−11.08	567
40–49	45.50	41.28	32.33	90.22	−41.22	640	51.00	48.42	30.11	98.38	−19.38	1082
50–59	37.00	33.88	38.42	94.44	−45.44	1429	44.00	39.46	32.21	91.18	−37.00	1792
60–69	32.00	28.81	38.48	89.00	−56.08	1247	38.00	35.19	35.28	89.00	−42.10	1296
70–79	36.00	27.75	44.85	85.70	−60.10	666	30.50	28.22	34.23	85.00	−45.00	760
>79	31.00	24.01	51.57	101.92	−70.00	255	29.00	27.66	42.02	88.54	−48.08	274