condition mean min max ZT0-3 2.7461975 2.34589 3.1465050000000003 ZT4-7 1.9582699999999997 1.9582699999999997 1.9582699999999997 ZT8-11 2.94041 2.94041 2.94041 ZT12-15 0 0 0 ZT16-19 2.8189149999999996 2.8189149999999996 2.8189149999999996 ZT20-23 2.971475 2.971475 2.971475