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Table 1 Comparison of baseline characteristics between the groups

From: Is annual surveillance of all treated hypothyroid patients necessary?

Baseline characteristics 12 monthly FU (n = 943) 18 monthly FU (n = 1182)
Age years mean (SD) 50.2 (13.9) 51.6 (12.8)
Thyroxine dose at registration (μg/day) mean (SD) 131.8 (41.4) 130.7 (43.1)
Age < 60 years (n = 1556) 73.4% 73.1%
Female (n = 1892) 90.3% 88.0%
Autoimmune hypothyroidism (n = 1384) 61.6% 67.9%
Mean duration of follow-up (years) mean (SD) 16.5 (4.6) 15.6 (4.4)