condition mean min max ZT0-3 2.6308350000000003 2.2197250000000004 3.041945 ZT4-7 2.2890550000000003 2.2890550000000003 2.2890550000000003 ZT8-11 2.124355 2.124355 2.124355 ZT12-15 0 0 0 ZT16-19 2.7700649999999998 2.7700649999999998 2.7700649999999998 ZT20-23 3.5667400000000002 3.5667400000000002 3.5667400000000002