ALB and in situ carcinoma: Although CP were significantly younger than CIS/MS patients [independent-samples t-test; 31.4 ± 9.1 vs. 35.7 ± 9.4, t(524) = 2.38, p = 0.018], none of the CSF protein concentrations significantly differed between the two groups [CP vs. CIS/MS; independent-samples t-test; protein in mg/L, 489 ± 149 vs. 535 ± 211, t(524) = 1.16, p = 0.25; albumin in mg/L, 234 ± 83 vs. 260 ± 116, t(524) = 1.21, p = 0.23; albumin CSF/serum ratio, 5.4 ± 1.9 vs. 5.8 ± 2.5, t(524) = 0.96, p = 0.34].