condition mean min max ZT0-3 2.11144 2.11144 2.11144 ZT4-7 1.0307944999999998 1.0307944999999998 1.0307944999999998 ZT8-11 0.8981295 0.8981295 0.8981295 ZT12-15 0.939997 0.939997 0.939997 ZT16-19 1.2434349999999998 1.2434349999999998 1.2434349999999998 ZT20-23 0.9709035 0.9709035 0.9709035