Table 2.

The percentage of mast cells showing interleukin (IL)-6 immunoreactivity in the upper dermis in Köbner-positive and -negative groups of psoriatic patients

	IL-6-positive mast cells at different time-points (%)
	0 days	2 h	1 day	3 days	7 days
Köbner-positive (n = 8)	42 ± 9 (n = 8)	41 ± 6 (n = 5)	51 ± 12 (n = 3)	37 ± 13 (n = 5)	49 ± 19 (n = 3)
Köbner-negative (n = 10)	33 ± 15 (n = 10)	20 ± 8 (n = 4)	32 ± 13 (n = 6)	30 ± 14 (n = 3)	31 ± 13 (n = 6)
P-value (unpaired t-test) between Köbner groups	0·152	0·00526		0·125

The results are expressed as the mean ± standard deviation. Statistically, no significant changes were observed within Köbner groups (paired t-test).