condition mean min max ZT0-3 12.112222221 12.112222221 12.112222221 ZT4-7 14.96 14.96 14.96 ZT8-11 13.00888889 13.00888889 13.00888889 ZT12-15 21.46888889 21.46888889 21.46888889 ZT16-19 20.812222222333332 20.812222222333332 20.812222222333332 ZT20-23 18.274444444333334 18.274444444333334 18.274444444333334