condition mean min max ZT0-3 263.286 263.286 263.286 ZT4-7 205.71300000000002 205.71300000000002 205.71300000000002 ZT8-11 129.085 129.085 129.085 ZT12-15 232.832 232.832 232.832 ZT16-19 446.73600000000005 446.73600000000005 446.73600000000005 ZT20-23 168.209 168.209 168.209