condition mean min max ZT0-3 1.7239550000000001 1.7239550000000001 1.7239550000000001 ZT4-7 0.598551 0.598551 0.598551 ZT8-11 0.6449565 0.6449565 0.6449565 ZT12-15 1.457995 1.457995 1.457995 ZT16-19 2.974165 2.974165 2.974165 ZT20-23 2.4300699999999997 2.4300699999999997 2.4300699999999997