Table 2 Probandwise concordance estimates on psoriasis and PsA
PsAMonozygotic twinsDizygotic twinsDifference (95% CI), p*
Moll and Wright criteria1/10 (10%)1/26 (3.7%)6.3% (−11%, 34%)
CASPAR criteria1/9 (11%)1/22 (4.5%)6.6% (−12%, 39%)
Psoriatic skin disease in twins with PsA6/11 (55%)6/28 (21%)34% (2%, 60%), p<0.05
  • PsA, psoriatic arthritis.

  • *p Value estimated using Fisher’s exact test on the pairwise concordance estimates.