condition mean min max ZT0-3 1.15069 1.15069 1.15069 ZT4-7 1.56532 1.56532 1.56532 ZT8-11 0.920927 0.920927 0.920927 ZT12-15 1.2445750000000002 1.2445750000000002 1.2445750000000002 ZT16-19 1.81394 1.81394 1.81394 ZT20-23 1.1767050000000001 1.1767050000000001 1.1767050000000001