condition mean min max ZT0-3 14.860600000000002 14.860600000000002 14.860600000000002 ZT4-7 6.388529999999999 6.388529999999999 6.388529999999999 ZT8-11 3.3890599999999997 3.3890599999999997 3.3890599999999997 ZT12-15 9.62978 9.62978 9.62978 ZT16-19 16.774250000000002 16.774250000000002 16.774250000000002 ZT20-23 22.72535 22.72535 22.72535