Table 4.

Composition of the 13 principal components (PCs) with each individual pelvic measurement weighting

Measurement location	PC1	PC2	PC3	PC4	PC5	PC6	PC7	PC8	PC9	PC10	PC11	PC12	PC13
Pubis to Ischium	0.28	0.02	0.32	0.04	−0.04	0.66	0.44	−0.36	0.01	−0.22	−0.04	0.055	0.01
L.Ischium	0.21	0.14	0.44	0.18	0.11	−0.33	0.10	0.21	−0.13	−0.04	0.33	0.58	0.18
R.Ischium	0.29	0.12	0.44	0.21	0.12	−0.29	0.03	0.15	−0.09	−0.09	−0.50	−0.50	−0.16
Span of Cranial Ilium	0.30	−0.22	−0.14	0.11	0.13	0.18	0.16	0.15	−0.15	0.81	−0.20	0.10	0.04
Width of Sacrum	0.27	−0.17	−0.10	0.01	−0.88	−0.24	0.23	0.05	0.07	−0.01	−0.01	−0.03	−0.00
L.Ilium	0.29	0.19	−0.47	0.10	0.16	−0.07	0.22	−0.01	−0.38	−0.19	0.24	−0.35	0.47
R.Ilium	0.28	0.21	−0.51	0.09	0.18	−0.11	0.15	−0.01	0.13	−0.25	−0.30	0.38	−0.47
L.Ischial Tuberosity	0.28	0.045	−0.01	−0.45	−0.03	0.37	−0.20	0.71	0.05	−0.19	0.02	−0.03	0.01
R.Ischial Tuberosity	0.25	0.03	0.09	−0.80	0.13	−0.31	0.06	−0.39	−0.00	0.14	−0.05	0.01	0.03
L.Oscoxa	0.32	0.06	0.02	0.11	0.04	0.02	−0.17	−0.10	0.13	0.18	0.64	−0.31	−0.53
R.Oscoxa	0.31	0.09	−0.05	0.18	0.06	0.00	−0.31	−0.15	0.73	0.05	−0.09	−0.02	0.45
Pelvic Inlet Diameter	0.29	−0.22	−0.02	0.10	−0.13	0.11	−0.68	−0.29	−0.46	−0.14	−0.14	0.16	−0.00
Internal Pelvic Angle	0.10	−0.86	−0.02	0.02	0.30	−0.14	0.15	0.06	0.14	−0.29	0.08	−0.04	−0.01

Each measurement is shown on radiographs in Fig. 1