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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