condition mean min max ZT0-3 179.0 179.0 179.0 ZT4-7 228.1 228.1 228.1 ZT8-11 259.8 259.8 259.8 ZT12-15 220.25 220.25 220.25 ZT16-19 492.59999999999997 492.59999999999997 492.59999999999997 ZT20-23 327.35 327.35 327.35