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. 2016 Jan-Feb;22(1):16–20. doi: 10.5830/CVJA-2015-059

Table 2. Comparison of age-dependent mean electrocardiographic indices and blood pressure parameters between cases and controls.

	2–5 years		6–10 years		11–15 years
ECG and BP parameters	Cases mean (SD)	Controls mean (SD)	Cases mean (SD)	Controls mean (SD)	Cases mean (SD)	Controls mean (SD)
HR (beats/min)	109.8 (9.0)	95.6 (13.1)^b	95.0 (9.6)	90.4 (1.0)^b	85.4 (1.5)	80.1 (5.1)^b
PR interval (ms)	141.1 (8.1)	135.9 (1.2)^b	156.4 (19.3)	142.7 (14.8)^b	161.7 (30.9)	136.9 (15.7)^b
QRS interval (ms)	77.2 (8.6)	72.1 (0.4)^b	86.4 (16.9)	75.2 (5.9)^b	89.5 (3.5)	81.9 (8.7)^b
QT interval (ms)	333.2 (16.7)	334.4 (28.2)^a	355.5 (18.9)	345.2 (20.5)^a	376.5 (31.2)	360.3 (13.5)^a
QT_C interval (ms)	449.6 (13.4)	421.9 (32.5)^b	445.4 (16.6)	415.4 (20.3)^b	451.9 (23.4)	415.7 (14.5)^b
P axis (°)	42.8 (12.3)	42.4 (19.4)^a	34.2 (18.9)	41.4 (11.7)^a	39.5 (22.0)	41.6 (13.2)^a
QRS axis (°)	43.8 (17.3)	58.0 (22.1)^a	38.8 (21.6)	54.7 (20.0)^b	47.9 (14.5)	53.3 (24.9)^a
T axis (°)	41.2 (13.4)	43.1 (16.7)^a	38.9 (17.8)	47.7 (11.7)^a	54.8 (50.5)	42.3 (16.5)^a
RV5 voltage (mV)	3.1 (1.0)	2.1 (0.9)^b	3.8 (0.8)	2.5 (0.6)^b	3.7 (0.9)	2.8 (0.4)^b
SV1 voltage (mV)	1.7 (0.7)	1.9 (0.6)^a	1.8 (0.6)	1.4 (0.8)^a	1.7 (0.4)	1.4 (0.3)^a
RV5 + SV1 voltage (mV)	4.8 (1.3)	4.0 (0.2)^b	5.6 (0.8)	3.9 (0.9)^b	5.4 (1.1)	3.9 (1.4)^b
SBP (mmHg)	76.4 (11.0)	82.3 (12.2)^a	89.0 (10.0)	83.3 (13.5)^a	94.6 (9.9)	95.0 (7.1)^a
DBP (mmHg)	43.6 (9.0)	54.2 (7.3)^b	46.3 (8.7)	55.8 (8.9)^b	52.6 (7.9)	60.0 (7.1)^b
MAP (mmHg)	54.5 (8.9)	63.6 (8.6)^b	60.5 (0.3)	65.0 (1.9)^b	66.6 (1.7)	71.7 (6.7)^b

SBP = systolic blood pressure; DBP = diastolic blood pressure; MAP = mean arterial pressure;

^aNo significant difference between cases and controls (p > 0.05);

^bSignificant difference between cases and controls (p < 0.05).