condition mean min max ZT0-3 4.97056 4.97056 4.97056 ZT4-7 3.8472799999999996 3.8472799999999996 3.8472799999999996 ZT8-11 2.9177150000000003 2.9177150000000003 2.9177150000000003 ZT12-15 3.2115400000000003 3.2115400000000003 3.2115400000000003 ZT16-19 5.532769999999999 5.532769999999999 5.532769999999999 ZT20-23 5.0038800000000005 5.0038800000000005 5.0038800000000005