condition mean min max ZT0-3 23.026144685 14.79917198 31.25311739 ZT4-7 44.03771166 39.96324522 48.1121781 ZT8-11 60.228063585 56.17703099 64.27909618 ZT12-15 51.418409203333326 48.806483306666664 54.030335099999995 ZT16-19 29.94681642833333 26.253288526666665 33.64034433 ZT20-23 19.647285946666663 19.49787136333333 19.79670053