condition mean min max ZT0-3 25.144750000000002 25.144750000000002 25.144750000000002 ZT4-7 15.97025 15.97025 15.97025 ZT8-11 20.493499999999997 20.493499999999997 20.493499999999997 ZT12-15 31.8228 31.8228 31.8228 ZT16-19 22.592950000000002 22.592950000000002 22.592950000000002 ZT20-23 32.4104 32.4104 32.4104