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Table 3 Reference studies containing mean concentration ± SD of porphyrins found in cases and controls

From: Porphyrins are increased in the faeces of patients with prostate cancer: a case-control study

Reference study Study type Control group (mean ± SD) Case group (mean ± SD) Confidence Level Power Calculated sample
Study of Protoporphyrin IX Elimination by Body Excreta: A new Noninvasive Cancer Diagnostic Method. [6] Experimental (Prostate cancer) 0.72 ± 0.12 2.73 ± 0.51 99% 90% 4
Concentration of protoporphyrin IX in cancer tissues and blood in patients with colorectal cancer at early stage. [4] Clinical (Colorectal cancer) 0.58 ± 0.08 2.28 ± 0.10 99% 90% 2