condition mean min max ZT0-3 2.14508 2.14508 2.14508 ZT4-7 1.439125 1.439125 1.439125 ZT8-11 1.36266 1.36266 1.36266 ZT12-15 2.9264349999999997 2.9264349999999997 2.9264349999999997 ZT16-19 5.24146 5.24146 5.24146 ZT20-23 2.2796000000000003 2.2796000000000003 2.2796000000000003