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Demographic and clinical characteristics of study participants

Sex n (%) Age (mean ± SD) BDAI (mean ± SD) VAS (itching) Anti-BMZ antibodies
Patients with BP n=71 F: 47 (66.2)M: 24 (33.8) 66.3 ± 15.0 39 ± 16 4 - 10 (median 8) 1:80 to 1:320 (median 1:160)
Controls n=100 F: 45 (45)M: 55 (55) 36.9 ± 12.5 - - -

Association of GSTM1 and GSTT1 polymorphisms with the risk of BP

Polymorphism BP n=71 n (%) Controls n=100 n (%) p-value OR (95% CI)
GSTM1 non-null 29 (40.8) 48 (48) 0.3541 0.75 (0.40-1.38)
GSTM1 null 42 (59.2) 52 (52) 0.3541 1.34 (0.72-2.47)
GSTT1 non-null 51 (71.8) 76 (76) 0.5389 0.81 (0.40-1.61)
GSTT1 null 20 (28.2) 24 (24) 0.5389 1.24 (0.62-2.48)
Double polymorphisms
GSTM1/GSTT1 non-null/non-null 20 (28.2) 37 (37) 0.2274 0.67 (0.35-1.29)
GSTM1/GSTT1 null/non-null 31 (43.6) 39 (39) 0.5412 1.21 (0.65-2.25)
GSTM1/GSTT1 non-null/null 9 (12.7) 11 (11) 0.7368 1.17 (0.46-3.00)
GSTM1/GSTT1 null/null 11 (15.5) 13 (13) 0.6437 1.23 (0.52-2.92)

The distribution of particular genotypes and alleles for the Ile105Val GSTP1 polymorphism in the group of BP patients and in the control group

Ile105Val GSTP1 polymorphism BP n=71 n (%) Controls n=100 n (%) p-value OR (95%CI)
Genotype
Ile/Ile (wild type) 46 (64.8) 65 (65) 0.9772 0.99 (0.52-1.87)
Ile/Val 20 (28.2) 31 (31) 0.6901 0.87 (0.45-1.70)
Val/Val 5 (7.0) 4 (4) 0.5958 1.82 (0.47-7.03)
GSTP1
Ile/Ile (wild type) 46 (64.8) 65 (65) 0.9772 0.99 (0.52-1.87)
Ile/Val and Val/Val 25 (35.2) 35 (35) 0.9772 1.01 (0.53-1.91)
Allele
Ile 112 (78.9) 161 (80.5) 0.7118 0.90 (0.53-1.54)
Val 30 (21.1) 39 (19.5) 0.7118 1.11 (0.65-1.89)

The combined effect of GST polymorphisms on the risk of BP

GSTs polymorphisms BP n=71 n (%) Control n=100 n (%) p-value OR (95% CI)
GSTM1 GSTT1 GSTP1
Non-null Non-null Ile/Ile 14 (19.7) 23 (23.0) 0.6076 0.82 (0.39- 1.74)
Non-null Null Ile/Ile 6 (8.5) 10 (10.0) 0.7318 0.83 (0.29- 2.40)
Null Non-null Ile/Ile 21 (29.6) 23 (23.0) 0.3323 1.41 (0.70- 2.80)
Null Null Ile/Ile 5 (7.0) 9 (9.0) 0.8594 0.77 (0.25- 2.39)
Non-null Null Ile/Val, Val/Val 3 (4.2) 1 (1.0) 0.3889 4.37 (0.44-42.88)
Null Non-null Ile/Val, Val/Val 11 (15.5) 16 (16.0) 0.9286 0.96 (0.42- 2,22)
Null Null Ile/Val, Val/Val 6 (8.5) 4 (4.0) 0.3727 2.22 (0.60- 8.16)
Non-null Non-null Ile/Val, Val/Val 5 (7.0) 14 (14.0) 0.2381 0.47 (0.16- 1.36)
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