Table 4

Variation in outcome variables between the northern city and east London localities

	n	Mean	Mean difference	SE difference	95% CI of the difference	t Test significance (two tailed)
Numbers of antidepressant Px
North study site	59 349	1.79	1.11	0.02	1.07 to 1.16	p<0.001
London study site	61 850	0.67	1.11	0.02	1.07 to 1.16	p<0.001
Number of sick notes issued
North study site	59 349	1.55	0.99	0.02	0.95 to 1/03	p<0.001
London study site	61 850	0.56	0.99	0.02	0.95 to 1/03	p<0.001
Number of admissions
North study site	59 349	0.41	0.06	0.01	0.04 to 0.08	p<0.001
London study site	61 850	0.35	0.06	0.01	0.04 to 0.08	p<0.001
Total days admitted, occupied bed days (OBD)
North study site	59 349	1.62	0.90	0.07	0.76 to 1.04	p<0.001
London study site	61 850	0.72	0.90	0.07	0.76 to 1.04	p<0.001
Number of outpatients attendances
North study site	59 349	1.98	0.09	0.03	0.04 to 0.15	p<0.001
London study site	61 850	1.89	0.09	0.03	0.04 to 0.15	p<0.001
Number of A&E attendances
North study site	59 349	0.38	0.08	0.01	0.06 to 0.09	p<0.001
London study site	61 850	0.30	0.08	0.01	0.06 to 0.09	p<0.001