Table 4

Definitions of physical health disorders exposure/outcome variables

VariableTime frameDatabaseOperation definition/ICD codes
Hypertension5 years prior to the birth of the index childPhysician claims
Hospital abstracts
Prescription claims		A woman was considered to have a history of hypertension if 5 years prior to the birth of the child she had:

  • 10. At least one physician visit or one hospitalisation with an ICD-9-CM code of 401–405 (ICD-10-CA codes I10–I13, I15), OR

  • 11. two or more prescriptions for hypertension drugs

Total respiratory morbidity5 years prior to the birth of the index childPhysician claims
Hospital abstracts
Prescription claims		A woman was considered to have a history of total respiratory morbidity if 5 years prior to the birth of the child she had:

  • One physician visit or hospitalisation in 1 year with: asthma, acute bronchitis, chronic bronchitis, bronchitis not specified as acute or chronic, emphysema or chronic airway obstruction (ICD-9-CM codes 466, 490, 491, 492, 493, 496; ICD-10 codes J20, J21, J40–J45).

Diabetes5 years prior to the birth of the index childPhysician claims
Hospital abstracts
Prescription claims		A woman was considered to have a history of diabetes if 5 years prior to the birth of the child she had:

  1. At least two physician visits or one hospitalisation with a diagnosis of diabetes (ICD-9-CM code 250; ICD-10-CA codes E10–E14), OR

  2. One or more prescriptions for medications to treat diabetes

Ischaemic heart disease5 years prior to the birth of the index childPhysician claims
Hospital abstracts
Prescription claims		A woman was considered to have a history of total respiratory morbidity if 5 years prior to the birth of the child she had:

  1. At least two physician visits or one hospitalisation for IHD (ICD-9-CM codes 410–414, ICD-10 codes I20–I22, I24, I25), OR

  2. At least one physician visit with a code listed above and two or more prescriptions for IHD medications