Table 1 Baseline patient and nodule characteristics

Patients, n

1,254

Women, %

89

Age, years

52.5 (13.1)

Thyroid nodules, n

1,819

Maximum diameter, cm

2.1 (1.0)

Volume, cm³

3.7 (7.2)

Nodule characteristics, %:

<50 % Cystic

88.5

≥50 % Cystic

11.5

Years from initial benign aspirate to first follow-up:

Median (interquartile range)

1.4 (1.0–2.5) years

Range

0.5–14.1 years

0.5–1 year, n

489

1–2 years, n

715

2–3 years, n

249

3–4 years, n

143

>4 years, n

223