condition mean min max ZT0-3 24.049999999999997 24.049999999999997 24.049999999999997 ZT4-7 2.0 2.0 2.0 ZT8-11 1.5499999999999998 1.5499999999999998 1.5499999999999998 ZT12-15 13.25 13.25 13.25 ZT16-19 8.75 8.75 8.75 ZT20-23 14.850000000000001 14.850000000000001 14.850000000000001