Table 1 Resting manometric parameters comparing 25 healthy (female x male)

London Protocol parameter

Mean maximum pressure (mmHg)

61.1

(16.3)

59.9

[51.9;74.0]

62.8

(14.7)

60.9

[50.7;75.3]

0.71

Complementary parameters

 Mean pressure

(mmHg)

38.4

(9.6)

38.9

[30.7;46.0]

42.1

(9.2)

40.0

[35.4;45.1]

0.20

 Functional anal canal length (cm)

3.5

(1.0)

3.6

[2.7;4.4]

3.9

(0.8)

3.9

[3.3;4.6]

0.14

3D parameters

 Resting PV (10 ⁴ mmHg ² .cm)

2.4

(1.5)

2.0

[1.1;3.3]

2.9

(1.6)

2.6

[1.7;3.6]

0.31

 Highest pressure asymmetry (%)

26.3

(9.8)

23.9

[19.3;29.9]

27.3

(9.6)

26.8

[21.1;32.5]

0.72

 Lowest pressure asymmetry (%)

27.1

(13.0)

25.4

[19.4;32.4]

23.2

(10.0)

22.6

[17.5;28.2]

0.31