condition mean min max ZT0-3 17.572661339 4.389862983 30.755459695 ZT4-7 73.62048423 67.254293405 79.986675055 ZT8-11 60.36763146 56.666857345 64.068405575 ZT12-15 25.520447465000004 14.036360755 37.004534175 ZT16-19 6.390532509250001 5.6968832285 7.084181790000001 ZT20-23 3.206263979 2.3470864535000002 4.0654415045