Table 2.

Coding of independent variables.

Variable	Variable coding
Gender	Male=1, Female=2
Medical payment methods	Provincial/municipal medical insurance = 1, Urban and rural residents medical insurance = 2, Self-paid = 3
131I therapy understanding	Unclear = 1, Moderately clear = 2, Clear = 3
Poor sleep quality	No = 0, Yes = 1
Social support level	Low = 1, Moderate = 2, High = 3
TSH stimulation	THW=1, rhTSH=2
Pulmonary metastasis	No = 0, Yes = 1
Neck scar concerns	No = 0, Yes = 1
Radiation exposure concerns	No = 0, Yes = 1
Concerns about THRT	No = 0, Yes = 1
25(OH)D	Original value