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Poisson regression formula. LT4 is levothyroxine; W is patient weight, in kilograms; A is patient age, in years; F patient sex (1 for female, 0 for males); B is patient body mass index (BMI); T is pre-operative thyroid-stimulating hormone (TSH) value; I is iron supplementation (1 for supplementation, 0 otherwise); M is multi-vitamin/mineral supplementation (1 for supplementation, 0 otherwise).
