condition mean min max ZT0-3 30.504545 30.504545 30.504545 ZT4-7 46.675098500000004 46.675098500000004 46.675098500000004 ZT8-11 67.154523 67.154523 67.154523 ZT12-15 39.305043999999995 39.305043999999995 39.305043999999995 ZT16-19 78.074513 78.074513 78.074513 ZT20-23 104.48407750000001 104.48407750000001 104.48407750000001