Table 5.

Incidence Rate of Advanced Chronic Kidney Disease (CKD) Among Adults With and Without Neurodevelopmental Disabilities (NDDs) with Complete Data on Race

	Advanced CKD Cases	Person-Years	Crude Incidence Rate	Incidence Rate Ratio (IRR)
	N	Years	N per 1000/Years (95% CI)	IRR (95% CI)
Without NDDs	92,416	14,839,117	6.23 (6.19, 6.27)	Reference
With NDDs	691	84,115	8.21 (7.60, 8.83)	1.32 (1.22, 1.42)
ID only	360	33,564	10.73 (9.62, 11.83)	1.72 (1.55, 1.91)
CP only	202	18,066	11.18 (9.64, 12.72)	1.80 (1.56, 2.06)
ASD only	79	23,147	3.41 (2.66, 4.17)	0.55 (0.44, 0.68)
Multiple NDDs*	50	9338	5.35 (3.87, 6.84)	0.86 (0.65, 1.13)

Notes: *Multiple NDDs were grouped together due to insufficient sample size to obtain reliable point estimates and confidence intervals. Multiple NDD groups include: ID+CP; ID+ASD; CP+ASD; or ID+CP+ASD. Two separate models were constructed with the adults without NDDs as the reference: the entire sample with NDDs; and the NDD subgroups (e.g., ID only). Reference indicates that the group was set as the reference to derive the effect estimates for the other groups.

Abbreviations: IRR, incidence rate ratio; CI, confidence interval; ID, intellectual disabilities; CP, cerebral palsy; ASD, autism spectrum disorders.