condition mean min max ZT0-3 5.570085000000001 5.570085000000001 5.570085000000001 ZT4-7 6.015755 6.015755 6.015755 ZT8-11 2.652105 2.652105 2.652105 ZT12-15 3.948045 3.948045 3.948045 ZT16-19 4.225185 4.225185 4.225185 ZT20-23 7.00024 7.00024 7.00024