condition mean min max ZT0-3 2032.8000000000002 2032.8000000000002 2032.8000000000002 ZT4-7 2404.0 2404.0 2404.0 ZT8-11 1688.5500000000002 1688.5500000000002 1688.5500000000002 ZT12-15 1319.4 1319.4 1319.4 ZT16-19 1170.85 1170.85 1170.85 ZT20-23 1473.35 1473.35 1473.35