condition mean min max ZT0-3 177.372527 177.372527 177.372527 ZT4-7 113.32736600000001 113.32736600000001 113.32736600000001 ZT8-11 55.6108205 55.6108205 55.6108205 ZT12-15 86.196118 86.196118 86.196118 ZT16-19 28.228125 28.228125 28.228125 ZT20-23 24.2951575 24.2951575 24.2951575