condition mean min max ZT0-3 1.3353391182499998 0.874599701 1.7960785355 ZT4-7 4.25016529575 3.1605340545 5.339796537 ZT8-11 7.14106999675 5.6535568435 8.62858315 ZT12-15 13.05177748 11.385284505000001 14.718270454999999 ZT16-19 12.5432025185 10.642450196999999 14.44395484 ZT20-23 23.00186506 19.7316339 26.27209622