condition mean min max ZT0-3 0.18721866666666667 0.1129015 0.2771245 ZT4-7 0.4262645 0.4262645 0.4262645 ZT8-11 0.9853915 0.9853915 0.9853915 ZT12-15 1.62343 1.315065 1.9317950000000002 ZT16-19 0.8307635 0.8307635 0.8307635 ZT20-23 1.64171 1.64171 1.64171