condition mean min max ZT0-3 11.79465 11.79465 11.79465 ZT4-7 10.393415000000001 10.393415000000001 10.393415000000001 ZT8-11 8.953595 8.953595 8.953595 ZT12-15 9.396975000000001 9.396975000000001 9.396975000000001 ZT16-19 12.79955 12.79955 12.79955 ZT20-23 9.65151 9.65151 9.65151