condition mean min max ZT0-3 26.50285 26.50285 26.50285 ZT4-7 23.05445 23.05445 23.05445 ZT8-11 18.492449999999998 18.492449999999998 18.492449999999998 ZT12-15 22.6315 22.6315 22.6315 ZT16-19 32.1399 32.1399 32.1399 ZT20-23 28.1432 28.1432 28.1432