condition mean min max ZT0-3 9.79201 9.79201 9.79201 ZT4-7 9.235070499999999 9.235070499999999 9.235070499999999 ZT8-11 9.668284 9.668284 9.668284 ZT12-15 9.457188 9.457188 9.457188 ZT16-19 9.263445 9.263445 9.263445 ZT20-23 8.961016 8.961016 8.961016