Table 2

Serum surfactant proteins‐A (SP‐A) and ‐D (SP‐D) levels in healthy volunteers according to site study

DenverIowaJapan
SP‐A ng·mL−1
 n4649246
 Median39.6022.2021.20
 75th percentile49.4031.5529.00
 25th percentile24.2810.1018.00
SP‐D ng·mL−1
 n4649131
 Median97.2586.9842.67
 75th percentile127.86125.3360.67
 25th percentile71.3161.6733.36