Table 4

Cox regression analyses of readmission with respiratory system disease following first hospitalisation, comparing people with/without intellectual disability (N=62 683)

Variables	Mean±SD/number	Proportion of readmission	HR (95% CI)
Variables	Mean±SD/number	Proportion of readmission	Separately entered variables (unadjusted)	Simultaneously entered variables (mutually adjusted)
Intellectual disability
No	62 286	37.62%	Ref	Ref
Yes	397	46.35%	1.36 (1.18 to 1.57)*	1.35 (1.17 to 1.56)*
Age at 1st admission (years old)	58.61±20.90	–	1.017 (1.016 to 1.018)*	1.016 (1.015 to 1.016)*
Gender
Female	34 465	37.09%	Ref	Ref
Male	28 209	38.40%	1.05 (1.02 to 1.07)*	1.03 (1.01 to 1.06)*
Unknown	9	0.00%	–	–
Ethnicity
White	40 067	41.77%	Ref	Ref
Black	10 043	31.53%	0.71 (0.69 to 0.74)*	0.87 (0.83 to 0.90)*
South Asian	2115	36.45%	0.84 (0.78 to 0.91)*	0.92 (0.86 to 0.99)*
East Asian	1477	29.45%	0.66 (0.60 to 0.72)*	0.77 (0.70 to 0.85)*
Others/mixed/unknown	8981	27.93%	0.62 (0.59 to 0.64)*	0.71 (0.68 to 0.74)*
Discharge method
Discharged on clinical advice/clinical consent	61 602	37.56%	Ref	Ref
Self-discharged, or by a relative/advocate	1059	44.48%	1.26 (1.15to 1.38)*	1.43 (1.31 to 1.57)*
Others	22	45.45%	1.51 (0.81 to 2.80)	1.64 (0.88 to 3.04)
Number of physical comorbidities
0–8	21 772	40.58%	Ref	Ref
9 or more	40 911	36.13%	0.79 (0.77 to 0.81)*	0.84 (0.82 to 0.86)*

*Statistical significance.