condition mean min max ZT0-3 1699.268443 1699.268443 1699.268443 ZT4-7 1438.90992 1438.90992 1438.90992 ZT8-11 1535.252864 1535.252864 1535.252864 ZT12-15 1728.36615 1728.36615 1728.36615 ZT16-19 1631.8273530000001 1631.8273530000001 1631.8273530000001 ZT20-23 1148.6872254999998 1148.6872254999998 1148.6872254999998