condition mean min max ZT0-3 193.1 193.1 193.1 ZT4-7 26.8 26.8 26.8 ZT8-11 73.25 73.25 73.25 ZT12-15 108.55000000000001 108.55000000000001 108.55000000000001 ZT16-19 164.89999999999998 164.89999999999998 164.89999999999998 ZT20-23 235.1 235.1 235.1