Then,the mathematical model established becomes (dr)/(dp)=-kr. Results The solution of the differential equation is r(p)=r(p_0) exp [-k(p-p_0)].

• 结果求解微分方程,得出衣原体感染率与安全套使用率的函数表达式为:r(p)=r(p_0)exp[-k(p-p_0)]。