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Table 1 Results of applying inclusion and exclusion criteria to identify potential trial participants from five general practices

From: The Health Informatics Trial Enhancement Project (HITE): Using routinely collected primary care data to identify potential participants for a depression trial

Criterion applied

Potential participants remaining

Aged 18 years and over

37263

Antidepressant therapy within last 3 months

2650

Lifetime diagnosis of moderate to severe depression

1247

Folate deficient <2.5 ng/L at any time

1237

B12 deficient <150 pg/ml at any time

1196

Taking folic acid supplements in last 2 months

1180

Lifetime diagnosis of psychosis

1116

Pregnant or planning pregnancy in last 10 months

1116

Taking anticonvulsants at any time

1008

Life expectancy less than 1 year

1007

Any unstable medical condition in last 12 months

976

Taking Lithium at any time

965

Lifetime diagnosis of malignancy

873

Adverse reaction to folic acid a any time

873

Depression resolved in last 3 months

872

Lifetime diagnosis of delirium

871

Lifetime diagnosis of learning disability

867

Final number of potential trial participants

867