condition mean min max ZT0-3 29.743512494999997 22.22084621 37.26617878 ZT4-7 18.269664405 14.37874399 22.16058482 ZT8-11 31.0406434875 25.93239642 36.148890555 ZT12-15 31.5160413375 28.436727735 34.59535494 ZT16-19 29.0781961375 25.587158185 32.56923409 ZT20-23 49.66237982 41.88018546 57.44457418