Table 1

Comparison of baseline characteristics between the groups

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)

Viswanath et al. BMC Endocrine Disorders 2007 7:4   doi:10.1186/1472-6823-7-4