TABLE 1.

Mean Z‐scores across age bands for subscales, domains and total scores of the neuropsychological assessment of dementia in adults with intellectual disability

Subscale	Mean Z score for age band (years)								Statistic			Post hoc
	30 and under (n = 49) (A)	31–35(n = 30) (B)	36–40(n = 54) (C)	41–45(n = 88) (D)	46–50(n = 75) (E)	51–55(n = 62) (F)	56–60(n = 26) (G)	61 and over (n = 28) (H)	F	df	p
Picture naming	0.52	0.08	0.13	0.23	−0.25	−0.24	−0.57	−1.0	7.7	7	≤0.001	A > E, G, HC, D > H
Picture identification	0.50	0.18	0.29	0.31	−0.35	−0.39	−0.63	−1.0	10.2	7	≤0.001	A > E, F, HB, C, D > H
Action on request	0.50	0.18	0.30	0.16	−0.28	−0.30	−0.54	−0.98	7.6	7	≤0.001	A > E, HB, C, D > H
Object memory	0.35	0.09	0.56	0.19	−0.18	−0.35	−0.78	−0.81	9.2	7	≤0.001	A, D > GC > E, F, G, H
Picture memory	0.47	0.16	0.52	0.11	−0.38	−0.32	−0.36	−0.85	8.0	7	≤0.001	A, C > E, H
Memory for sentences	0.56	0.06	0.57	0.05	−0.26	−0.12	−0.54	−0.55	7.6	7	≤0.001	A > G, HC > E, G, H
‘Early’ domain	0.40	0.17	0.50	0.14	−0.33	−0.36	−0.50	−0.72	6.6	7	≤0.001	A, C > H
‘Late’ domain	0.55	0.16	0.26	0.26	−0.32	−0.34	−0.63	−1.1	10.1	7	≤0.001	A > E, F, GB, C, D > H
Total score	0.54	0.18	0.36	0.24	−0.35	−0.38	−0.63	−1.1	10.4	7	≤0.001	A > E, F, G, HB, C, D > H