Table 4. Change in ECG readings from baseline to post 1-minute and post 10-minute.

	Baseline	Post 1-minute	Post 10-minute	P-value
PR interval (ms)
Control	141.0±28.4	144.6±27.8	143.9±26.5	0.047*
Thoracic SMT	156.2±21.2	154.9±23.4	158.7±12.1	0.046*
Baseline P	0.037*
QRS duration (ms)
Control	93.0±18.2	94.9±18.8	93.8±18.3	0.150
Thoracic SMT	91.8±8.5	94.1±9.1	89.9±8.3	0.025*
Baseline P	0.767
QT (ms)
Control	396.7±26.9	397.1±27.7	400.0±28.1	0.078
Thoracic SMT	392.8±30.4	386.2±65.7	396.0±28.2	0.483
Baseline P	0.631
QTc (ms)
Control	428.0±21.7	430.0±19.1	432.2±18.2	0.286
Thoracic SMT	425.3±29.4	415.2±69.1	426.2±28.6	0.419
Baseline P	0.715

Data listed as mean±standard deviation (SD).

*Statistically significant data.

Within-group data were analyzed with repeated measures ANOVA.

Between-group baseline data were compared with an independent samples t-test

SMT: spinal manipulative therapy.