condition mean min max ZT0-3 52.314868 52.314868 52.314868 ZT4-7 57.763981 57.763981 57.763981 ZT8-11 55.689797 55.689797 55.689797 ZT12-15 53.0669645 53.0669645 53.0669645 ZT16-19 105.973904 105.973904 105.973904 ZT20-23 91.825056 91.825056 91.825056