condition mean min max ZT0-3 35.4213488625 29.058697015 41.78400071 ZT4-7 21.25772644 19.060602855 23.454850025 ZT8-11 27.95114006 24.39251413 31.50976599 ZT12-15 22.58022751 19.10813445 26.05232057 ZT16-19 12.48896293 10.879225134999999 14.098700725 ZT20-23 10.012830529 9.5713692545 10.4542918035