condition mean min max ZT0-3 154.844177 154.844177 154.844177 ZT4-7 135.562872 135.562872 135.562872 ZT8-11 153.716879 153.716879 153.716879 ZT12-15 166.815744 166.815744 166.815744 ZT16-19 197.61377 197.61377 197.61377 ZT20-23 205.88727649999998 205.88727649999998 205.88727649999998