Table 3

Multivariable adjusted relative risk (RR) and 95% CI of developing rheumatoid arthritis by long-term intake of dietary long-chain n-3 polyunsaturated fatty acids and by long-term consumption of fish during 1987 and 1997, the Swedish Mammography Cohort (n=32 232), follow-up 2003–2010

CasesMultivariable-adjusted RR (95% CI)CasesMultivariable-adjusted RR (95% CI)
Intake 1987
Dietary long-chain n-3 polyunsaturated fatty acids*Intake 1997≤0.21 g/day>0.21 g/day
≤0.21 g/day431.00120.52 (0.27 to 0.98)
>0.21 g/day690.63 (0.43 to 0.92)810.48 (0.33 to 0.71)
Fish†Intake 1997<1 serving/week≥1 serving/week
<1 serving/week421.00360.78 (0.50 to 1.22)
≥1 serving/week431.01 (0.66 to 1.56)840.71 (0.48 to 1.04)
  • *Adjusted for age (continuous), cigarette smoking (never, former, current ≤10 cigarettes/day or >10 cigarettes/day), alcohol intake (never, former, current <2 drinks/week, ≥2 drinks/week), use of aspirin (yes, no) and intake energy (quintiles).

  • †Adjusted for age (continuous), cigarette smoking (never, former, current ≤10 cigarettes/day or >10 cigarettes/day), alcohol intake (never, former, current <2 drinks/week, ≥2 drinks/week), use of aspirin (yes, no), red meat consumption (quartiles), dairy food consumption (quartiles) and energy intake (quartiles).