condition mean min max ZT0-3 1.13604 1.13604 1.13604 ZT4-7 1.52275 1.52275 1.52275 ZT8-11 1.3357800000000002 1.3357800000000002 1.3357800000000002 ZT12-15 1.23566 1.23566 1.23566 ZT16-19 1.615935 1.615935 1.615935 ZT20-23 1.53645 1.53645 1.53645