condition mean min max ZT0-3 7.139620000000001 7.139620000000001 7.139620000000001 ZT4-7 3.106755 3.106755 3.106755 ZT8-11 4.40437 4.40437 4.40437 ZT12-15 8.385185 8.385185 8.385185 ZT16-19 16.5609 16.5609 16.5609 ZT20-23 9.55461 9.55461 9.55461