Table 2 The relation between the frequency of proline iminopeptidase negative N gonorrhoeae and gender and/or sexual orientation of patient (p⩽0.001).

		Frequency of Pip negative N gonorrhoeae isolates (no of Pip negative isolates)
MSM (460)		8.47 (39)
Male (575)		2.43 (14)
Female (541)		2.40 (13)

Total = 1576, excludes 479 isolates where the sexual orientation and/or gender of the patient was unknown.