Table 3

Variables excluding infancy data which best discriminate between positive and negative genetic diagnoses of PWS

				Classification results
						Predicted group
Action step entered removed	Vars in	Wilks’ Lambda	Sig	Actual group	No of cases	1	2
(A) PWS +ve genet v control hypogonadism excluded 53 PWS and 16 control had full data
1 Small hands or feet	1	0.47241	0.0000	Group 1	78	73	5
2 Thick saliva	2	0.34721	0.0000			93.6%	6.4%
3 Not feel hot/cold	3	0.29825	0.0000	Group 2	22	1	21
4 Stubborn > usual	4	0.27820	0.0000			4.5%	95.5%
				Ungrouped	18	12	6
						66.7%	33.3%
				Percent of “grouped” cases correctly classified: 94.0%

(B) PWS +ve genet v control hypogonadism included 42 PWS +ve and 12 control had full data
1 Hypogonadism	1	0.22736	0.0000	Group 1	80	79	1
2 Small hands or feet	2	0.15904	0.0000			98.8%	1.3%
				Group 2	22	5	17
						22.7%	77.3%
				Ungrouped	20	13	7
						65%	35%
				Percent of “grouped” cases correctly classified: 94.1%

(C) PWS +ve genet v PWS -ve genet combined with control hypogonadism excluded 53 PWS +ve, 4 PWS -ve, and 16 control had full data
1 Small hands or feet	1	0.48512	0.0000	Group 1	88	82	6
2 Thick saliva	2	0.35625	0.0000			93.2%	6.8%
3 Vomiting	3	0.31691	0.0000	Group 2	41	12	29
4 Stubborn > usual	4	0.29990	0.0000			29.3%	70.7%
				Ungrouped	8	5	3
						62.5%	37.5%
				Percent of “grouped” cases correctly classified: 86.1%

(D) PWS +ve genet v PWS -ve genet combined with control hypogonadism included 42 PWS +ve, 3 PWS -ve, and 12 control had full data
1 Hypogonadism	1	0.44567	0.0000	Group 1	77	76	1
2 Small hands or feet	2	0.29624	0.0000			98.7%	1.3%
3 Thick saliva	3	0.27508	0.0000	Group 2	33	8	25
						24.2%	75.8%
				Percent of “grouped” cases correctly classified: 91.8%