Growth of solutions of linear differential equations with meromorphic coefficients of [p,q]-order

In this paper, we investigate the growth of meromorphic solutions to a complex higher order linear differential equation whose coefficients are meromorphic functions of $[p,q]$-orders. We get the results about the lower $[p,q]$-order of solutions of the equation. Moreover, we investigate the $[p,q]$-convergence exponent and the lower $[p,q]$-convergence exponent of distinct zeros of $f(z)-varphi(z).