Table 3 Preclinical antibody positivity for all subjects divided into age-at-diagnosis groups for rheumatoid factor (RF) and anti-cyclic citrullinated peptide (anti-CCP)*
Age at diagnosis(years)NoPreclinical RF positivity (>15.2 IU/ml)Preclinical anti-CCP positivity (>5 U/ml)
20–291611/16 (68.8)12/16 (75.0)
30–392516/25 (64.0)14/25 (56.0)
40–492514/25 (56.0)17/25 (68.0)
50+176/17 (35.3)8/17 (47.1)

  • *Percentages based on number of subjects with preclinical antibody positivity in that age group.