condition mean min max ZT0-3 4320.538037 4320.538037 4320.538037 ZT4-7 2853.6009145 2853.6009145 2853.6009145 ZT8-11 2620.151324 2620.151324 2620.151324 ZT12-15 3140.6937775 3140.6937775 3140.6937775 ZT16-19 3004.6061520000003 3004.6061520000003 3004.6061520000003 ZT20-23 2081.3768615 2081.3768615 2081.3768615