condition mean min max ZT0-3 7.4738050000000005 7.4738050000000005 7.4738050000000005 ZT4-7 5.25287 5.25287 5.25287 ZT8-11 5.10926 5.10926 5.10926 ZT12-15 5.713445 5.713445 5.713445 ZT16-19 10.393699999999999 10.393699999999999 10.393699999999999 ZT20-23 7.98311 7.98311 7.98311