condition mean min max ZT0-3 8.0415225 6.81587 9.267175 ZT4-7 14.35725 14.35725 14.35725 ZT8-11 16.455849999999998 16.455849999999998 16.455849999999998 ZT12-15 0 0 0 ZT16-19 13.27355 13.27355 13.27355 ZT20-23 10.9122 10.9122 10.9122