Table 3.

Cluster regression for referral at 24 months (analysis accounting for clusters within families) including group, age, and IMD quintile

	Risk difference				Risk ratio
	coefficient	std. error	95% CI		coefficient	std. error	95% CI
Control (reference)
Intervention	0.024	0.013	−0.001	0.049	1.359	0.228	0.975	1.890
Cluster strata = 1 child family (reference)
Cluster strata = 2 or more child family	0.044	0.013	0.019	0.069	1.881	0.443	1.190	2.996
Age at recruitment	0.007	0.003	0.001	0.014	1.123	0.050	1.029	1.226
IMD quintile = 1	0.000	0.000			1.000	0.000
IMD quintile = 2	−0.011	0.015	−0.041	0.018	0.946	0.207	0.615	1.453
IMD quintile = 3	−0.016	0.020	−0.055	0.023	0.675	0.234	0.342	1.335
IMD quintile = 4	−0.004	0.021	−0.046	0.037	1.026	0.313	0.564	1.865
IMD quintile = 5	0.003	0.027	−0.050	0.056	1.231	0.389	0.662	2.288
Intercept	−0.009	0.025	−0.058	0.041	0.019	0.008	0.009	0.041
	Wald test of IMD χ2(4) = 1.00, p = 0.91 ICC 0.02				Wald test of IMD χ2(4) = 1.99, p = 0.74