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Table 1 The GM (1,1) model of each STD

From: Impact of COVID-19 pandemic on the epidemiology of STDs in China: based on the GM (1,1) model

  a b b/a GM (1,1) model
HIV infection − 0.077 2.998 − 39.026 \({\widehat{x}}^{(0)}(k+1)=3.117{e}^{0.077k}\)
Syphilis − 0.037 28.922 − 785.691 \({\widehat{x}}^{(0)}(k+1)=29.482{e}^{0.037k}\)
Gonorrhea − 0.090 6.050 − 67.028 \({\widehat{x}}^{(0)}(k+1)=6.420{e}^{0.090k}\)