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Table 3 Gamma regression model factors influencing annual total health care costs: migraine, sex and age were preset, comorbidities selected by the Bayesian Information Criterion (BIC). Exponents can be interpreted as multiplicative cost factors. Estimates with p < 0.05 are printed in bold

From: Total health insurance costs in children with a migraine diagnosis compared to a control group

  Exponents of the coefficients
Intercept 134.16
Migraine 1.16
Sex: Girls 0.88
Age 1.00
Comorbidities
 Certain infectious and parasitic diseases 1.14
 Neoplasms (A, B) 1.10
 Diseases of the blood and blood-forming organs and certain disorders involving the immune mechanism (D50-D90) 1.16
 Endocrine, nutritional and metabolic diseases (E) 1.40
 Mental and behavioural disorders (F) 3.24
 Diseases of the nervous system (Ga) 1.88
 Diseases of the eye and adnexa (H00-H59) 1.32
 Diseases of the ear and mastoid process (H60-H95) 1.22
 Diseases of the circulatory system (I) 1.26
 Diseases of the respiratory system (J) 1.30
 Diseases of the digestive system (K) 1.24
 Diseases of the skin and subcutaneous tissue (L) 1.13
 Diseases of the musculoskeletal system and connective tissue (M) 1.28
 Diseases of the genitourinary system (N) 1.11
 Congenital malformations, deformations and chromosomal abnormalities (Q) 1.35
 Symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified (Rb) 1.24
 Injury, poisoning and certain other consequences of external causes (S, T) 1.39
 Codes for special purposes (U) 1.64
 Factors influencing health status and contact with health services (Z) 1.22
  1. aChapter G Diagnoses without ICD G43 and G44, b Chapter R diagnoses without ICD R51