condition mean min max ZT0-3 7.853924999999999 7.694284999999999 8.013565 ZT4-7 5.198895 5.198895 5.198895 ZT8-11 5.96969 5.96969 5.96969 ZT12-15 0 0 0 ZT16-19 7.681675 7.681675 7.681675 ZT20-23 7.19914 7.19914 7.19914