Table 2.

Comparing patients in groups I and II as regards PASI score, interleukin-17, and interleukin-18 before and after treatment with both narrow band UVB and methotrexate.

Patient group (Number = 15)	Mean	Standard deviation	t	P value	Significance
PASI (before treatment)
Group I	21.1	0.6	−1.43	0.1	Nonsignificant
Group II	24.7	0.9
PASI (after treatment)
Group I	15.4	1.2	−0.12	0.9	Nonsignificant
Group II	16.8	1.1
IL-17 (ng/L) before treatment
Group I	2.0	1.5	−0.36	0.7	Nonsignificant
Group II	2.2	0.7
IL-17 (ng/L) after treatment
Group I	1.3	1.2	0.40	0.6	Nonsignificant
Group II	1.1	0.5
IL-23 (ng/L) before treatment
Group I	499.1	207.1	0.79	0.4	Nonsignificant
Group II	440.9	193.8
IL-23 (ng/L) after treatment
Group I	281.7	214.1	0.08	0.9	Nonsignificant
Group II	276.0	179.3

The independent samples t-test.