condition mean min max ZT0-3 37.476425 37.16525 37.7876 ZT4-7 27.608249999999998 27.608249999999998 27.608249999999998 ZT8-11 16.4283 16.4283 16.4283 ZT12-15 0 0 0 ZT16-19 18.70015 18.70015 18.70015 ZT20-23 32.796350000000004 32.796350000000004 32.796350000000004