Chinese Herbal Medicines for Rheumatoid Arthritis: Text-Mining the Classical Literature for Potentially Effective Natural Products

Table 1

Citations of interventions for conditions broadly consistent with rheumatoid arthritis by historical period.

Historical period (dynasty)^1	Frequency (percentage)
Before Tang dynasty (−617)	1 (0.20)
Tang and 5 dynasties (618–959)	4 (0.70)
Song Jin dynasties (960–1271)	52 (9.5)
Yuan dynasty (1272–1368)	11 (2.0)
Ming dynasty (1369–1644)	245 (44.7)
Qing dynasty (1645–1911)	221 (40.3)
Ming Guo period (1912–1949)	14 (2.6)
Total	548 (100)

¹The dividing points between dynasties are open to interpretation, so the years have been adjusted to avoid overlap. When authors lived across two dynasties, the dynasty usually cited for the book was adopted. See May et al. [36] for how book years were determined.