condition mean min max ZT0-3 155.385903 155.385903 155.385903 ZT4-7 146.098896 146.098896 146.098896 ZT8-11 119.1762195 119.1762195 119.1762195 ZT12-15 141.27938799999998 141.27938799999998 141.27938799999998 ZT16-19 140.355158 140.355158 140.355158 ZT20-23 191.06354549999998 191.06354549999998 191.06354549999998