Table 2

Covariates included in the regression models: descriptive statistics

Variable descriptionDataBipolar disorderSMI
SourceMeanSDMinimumMaximumMeanSDMinimumMaximum
GP practice characteristics
 =1 if GP practice is reimbursed under PMSGMS0.430.50010.430.5001
 Proportion of male GPs/practiceGMS0.600.27010.610.2701
 Proportion of non-UK qualified GPs/practiceGMS0.310.36010.330.3801
 Mean age of GPs/practiceGMS47.687.35287648.057.652876
 Practice list sizeADS68994008104040 08267074008104040 082
Characteristics of the practice population
 Patient population: average ageADS39.084.0521.9756.4338.914.1521.5656.43
 Patient population: proportion of male patientsADS0.500.020.380.780.500.020.380.79
 Proportion claiming incapacity benefit for mental health, practice catchment areaDWP0.020.010.000.070.020.010.000.07
 Proportion providing informal care, practice catchment areaONS0.100.010.050.150.100.010.050.15
 NHS psychiatric residents per 1000 population, practice catchment areaONS0.191.10063.570.191.12063.57
 Proportion of non-white ethnicity, practice catchment areaONS0.110.150.000.800.110.160.000.81
 Proportion living in urban setting, practice catchment areaONS0.820.33010.820.3301
Measures of access to care
 Distance (in miles) from practice to closest acute hospitalHES4.854.98059.444.744.91059.44
 Distance (in miles) from practice to closest mental health hospitalHES10.718.35074.0510.558.27074.05
 Proportion of practice patients able to access care within 48 hGPPS0.840.11010.840.1101
Baseline admissions
 Mean number of admissions between April 2004 and March 2006HES1.581.770424.374.29063
  • ADS, Attribution Data Set; DWP, Department for Work and Pensions; GMS, General Medical Services; GP, general practitioner; GPPS, GP patient survey; HES, Hospital Episode Statistics; ONS, Office for National Statistics, Neighbourhood Statistics; PMS, Personal Medical Services; SMI; serious mental illness.