condition mean min max ZT0-3 7.947979999999999 5.682359999999999 10.2136 ZT4-7 6.664425 6.664425 6.664425 ZT8-11 14.0687 14.0687 14.0687 ZT12-15 0 0 0 ZT16-19 8.745045000000001 8.745045000000001 8.745045000000001 ZT20-23 7.766500000000001 7.766500000000001 7.766500000000001