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Study population. A total of 441,485 individuals who had outpatient serum TSH and creatinine measurements were identified. After 63,384 patients were excluded based on exclusion criteria, 378,101 individuals were included in our study population. Among this cohort, 114,872 (30.4%) individuals had hypothyroidism, among whom 31,242 (27.2%) had hypothyroid status and 83,630 (72.8%) had attenuated-hypothyroid status. TSH = thyroid-stimulating hormone.
