Appendix 1

- Normal anogenital distances reference ranges for each gestational week: 2.5th to 97th centiles.

Centile	11 weeks	12 weeks	13 weeks
Male
2.5^th	3.82	4.78	5.36
5^th	4.12	5.10	5.73
10^th	4.46	5.46	6.17
25^th	5.03	6.07	6.89
50^th	5.66	6.74	7.70
75^th	6.29	7.41	8.51
90^th	6.86	8.02	9.23
95^th	7.20	8.38	9.67
97.5^th	7.50	8.70	10.04
Female
2.5^th	3.06	3.84	4.59
5^th	3.35	4.15	4.97
10^th	3.67	4.51	5.42
25^th	4.22	5.11	6.17
50^th	4.83	5.78	7.00
75^th	5.43	6.44	7.83
90^th	5.98	7.04	8.58
95^th	6.31	7.40	9.02
97.5^th	6.59	7.72	9.41

All readings are in millimeters.