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. 2022 Mar 17;50(5):1179–1190. doi: 10.1007/s15010-022-01791-1

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Fig. 4 — Interrupted time series plot of annual change of congenital syphilis notification rate in Guangdong Province and the three regions before and after the implementation of the CS control measures. The intervention year was 2012. The slope and level change of the province were both significant, P < 0.05 (a). The level change in the PRD region (b) and North ecological development zone (d) were both significant, P < 0.05; the slope change in the North ecological development zone (Fig. 4d) and Eastern and Western wings (c) were both significant, P < 0.05