condition mean min max ZT0-3 20.551163333333335 9.61369 27.187350000000002 ZT4-7 7.414765 7.414765 7.414765 ZT8-11 13.771149999999999 13.771149999999999 13.771149999999999 ZT12-15 20.3535 19.95395 20.75305 ZT16-19 21.084 21.084 21.084 ZT20-23 34.76035 34.76035 34.76035