condition mean min max ZT0-3 0.5195521666666667 0.2920805 0.741267 ZT4-7 0.1502447 0.1502447 0.1502447 ZT8-11 0.916286 0.916286 0.916286 ZT12-15 0.71202825 0.6908975 0.733159 ZT16-19 0.76945 0.76945 0.76945 ZT20-23 0.6487160000000001 0.6487160000000001 0.6487160000000001