Table 5 Summary of all predictors used by NRCBM categorised into predictor groups

Any time

Any time prior to index date

Categorical

NHS Read code from disorder-related list

Developmental delay, early childhood emotional problems, missed immunizations, neonatal health problems, and early/late puberty

Two year

Within two years prior to index date

Categorical

NHS Read code and/or disorder drug code list

Anxiety, low mood,

tiredness, loss of enjoyment, too little sleep, too much sleep, eating disorders, weight loss, weight gain, bed wetting, excessive sweating, self-harm, headache, dyspepsia, dysmenorrhea, abdominal pain, back pain, ill-defined conditions, other somatic symptoms, skin problems, divorce, homelessness, bereavement, unemployment, family history of abuse or neglect, family history of drug misuse, family history of alcohol misuse, family history of depression, abuse/neglect/non-accidental injury, police involvement, other social services involvement, psychosexual problems, school problems, teenage pregnancy, work stress and young carer. Asthma, diabetes, dyspepsia and epilepsy

Smoker, missing

Within two years prior to index date

Categorical

NHS Read code (covers smoker, ex-smoker and never smoked), or “Missing” meaning no data

Smoker

Missing

Count

Within one year prior to index date

Integer

Match person to GP contact database to obtain the number of visits in the year

Count

Townsend Index of Deprivation

At time of data extraction

Quintile (Integer 1 to 5)

Match person to practice Identifying quintile

Deprivation Index (IMD)