condition mean min max ZT0-3 5.414055 5.414055 5.414055 ZT4-7 1.97228 1.97228 1.97228 ZT8-11 2.29258 2.29258 2.29258 ZT12-15 3.3225700000000002 3.3225700000000002 3.3225700000000002 ZT16-19 5.7684750000000005 5.7684750000000005 5.7684750000000005 ZT20-23 8.19234 8.19234 8.19234