Table 4.

Comparison of P Wave Duration Values Among Groups before and after Primary Percutaneous Coronary Intervention

	Group 1 (n = 12)	Group 2 (n = 9)	Group 3 (n = 104)	P Value
PWD (ms)
Before	70.0 ± 6.7	75.0 ± 9.4	68.9 ± 15.6	0.46a
After	89.1 ± 6.6λ	76.0 ± 13.7λλ	45.8 ± 12.2λλλ	<0.001b
P maximum (ms)
Before	114.1 ± 9.9	119.0 ± 5.16	117.2 ± 11.5	0.61a
After	133.3 ± 7.7γ	123.2 ± 4.6γγ	94.4 ± 6.5γγγ	<0.001b
P minimum (ms)
Before	44.1 ± 5.1	44.0 ± 8.4	48.3 ± 10.6	0.32a
After	44.2 ± 5.2	46.9 ± 8.2	48.5 ± 10.7	0.53a

PWD, P wave dispersion.

Values are presented as mean ± SD.

^aKruskal–Wallis test.

^bBonferroni adjusted Mann–Whitney U test.

P = 0.02 for λ versus λλ, P < 0.001 for λ versus λλλ and λλ versus λλλ.

P = 0.005 for γ versus γγ, P < 0.001 for γ versus γγγ and γγ versus γγγ.