condition mean min max ZT0-3 56.740139 56.740139 56.740139 ZT4-7 31.8665345 31.8665345 31.8665345 ZT8-11 42.742166499999996 42.742166499999996 42.742166499999996 ZT12-15 51.3621045 51.3621045 51.3621045 ZT16-19 104.7206435 104.7206435 104.7206435 ZT20-23 87.307211 87.307211 87.307211