condition mean min max ZT0-3 11.090512499999999 9.853225 12.3278 ZT4-7 5.91416 5.91416 5.91416 ZT8-11 6.668055 6.668055 6.668055 ZT12-15 0 0 0 ZT16-19 8.313995 8.313995 8.313995 ZT20-23 8.421824999999998 8.421824999999998 8.421824999999998