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. 2021 Jan 25;19:14. doi: 10.1186/s12916-020-01890-6

Fig. 1.

Fig. 1

Secular trends of the overall and parity-specific CD rates from 2012 to 2019, by year. Gray triangles: annual CD rates for all births; blue triangles: annual CD rates for nulliparas; orange triangles: annual CD rates for multiparas. Annual percentage change (APC) of the CD rates estimated by joinpoint regression models was shown in the right gray frame. The CD rates before and after 2016 were listed in the below gray frame, along with the adjusted RRs and 95% CI represented the change pattern after 2016