Table 2 Types and parameter estimates of the distributions of the patient characteristics in the prevalent population on January 1, 1996 and in each yearly incident cohort

Age of male

N (42.5, 12.6)

N (33.7, 8.14)

Age of female

N (46.3, 12.7)

N (33.7, 8.14)

Gender (male)

Bern (0.69)

Same as PP

Symptom duration

N (0.64 × Age − 7.76, 1.20 × \(\sqrt {Age}\))^b

Same as PP

Diagnosis duration

N (3.1, 1.3)^c

0

Proportion of patients with paid jobs

Bern (0.75)

Same as PP

Proportion of paid-job patients being work disabled

Bern (0.20)

Same as PP

Contraindication to anti-TNF agents

Bern (0.20)

Same as PP

BASDAI

N (1.72, 0.63)^c

N (1.91, 0.52)^c

BASFI of male patient

N (0.69 × BASDAI + 1.89, 1.69)^d

N (0.60 × BASDAI + 2.62, 1.42)^d

BASFI of female patient

N (0.92 × BASDAI + 0.19, 1.00)^d

N (0.91 × BASDAI + 0.27, 0.81)^d