condition mean min max ZT0-3 3914.3500000000004 3914.3500000000004 3914.3500000000004 ZT4-7 6041.7 6041.7 6041.7 ZT8-11 5835.35 5835.35 5835.35 ZT12-15 4056.7999999999997 4056.7999999999997 4056.7999999999997 ZT16-19 2919.8 2919.8 2919.8 ZT20-23 3212.75 3212.75 3212.75