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. Author manuscript; available in PMC: 2019 Apr 1.
Published in final edited form as: Semin Arthritis Rheum. 2017 Sep 18;47(5):639–648. doi: 10.1016/j.semarthrit.2017.09.005

Table 3.

Frequencies of incident COPD and asthma after index date during follow-up in the Nurses’ Health Study (1976–2014) for women with RA and matched comparators.

Rheumatoid arthritis Comparators
Entire analyzed study sample
 COPD, cases/n (%) 68/843 (8.1%) 459/8,399 (5.5%)
 Asthma, cases/n (%)* 40/843 (4.7%) 268/8,399 (3.2%)
Among never smokers at index date
 COPD, cases/n (%) 9/300 (3.0%) 85/3,700 (2.3%)
 Asthma, cases/n (%)* 14/300 (4.7%) 114/3,700 (3.1%)
Among never or <10 pack-years at index date
 COPD, cases/n (%) 19/438 (4.3%) 128/5,115 (2.5%)
 Asthma, cases/n (%)* 19/438 (4.3%) 163/5,115 (3.2%)
Follow-up after index date, person-years** 15,716 157,768
Mean follow-up after index date per participant, years (SD)** 18.6 (9.0) 18.8 (9.5)
*

Women who reported both asthma and COPD during follow-up were classified as COPD for all analyses.

**

Follow-up is reported for the entire analyzed study sample.

COPD, chronic obstructive pulmonary disease; SD, standard deviation.