condition mean min max ZT0-3 2.5409550000000003 1.6462400000000001 3.43567 ZT4-7 1.1234950000000001 1.1234950000000001 1.1234950000000001 ZT8-11 3.778345 3.778345 3.778345 ZT12-15 0 0 0 ZT16-19 3.217853 3.217853 3.217853 ZT20-23 3.7344049999999998 3.7344049999999998 3.7344049999999998