Table 2

 Basic demographic data of patients with CTEPH, IPAH and control subjects

CTEPH(n = 257)IPAH(n = 276)Control(n = 180)
CTEPH, chronic thromboembolic pulmonary hypertension; IPAH, idiopathic pulmonary arterial hypertension; CI, confidence interval.
*p<0.01 IPAH v control groups (χ2 or unpaired Student’s t tests, as appropriate).
†p<0.05 CTEPH v control groups (χ2 test).
Sex ratio (F:M)0.9:11.5:1†0.8:1
Mean (SD) age (years)51 (14)*46 (15)47 (9)
No (%) of patients with splenectomy (with 95% CI)22 (8.6%)*(5.2 to 12)7 (2.5%)(0.7 to 4.4)1 (0.6%)(0.0 to 1.6)