condition mean min max ZT0-3 4.20964498025 1.2563184105 7.16297155 ZT4-7 2.5540297 0.5584148775 4.5496445225 ZT8-11 20.93140256475 15.1473426045 26.715462525 ZT12-15 64.39078038 63.952941065 64.828619695 ZT16-19 35.7328522775 34.961835820000005 36.503868735 ZT20-23 43.29305037 40.398016415 46.188084325