condition mean min max ZT0-3 13.718364 13.718364 13.718364 ZT4-7 12.596204 12.596204 12.596204 ZT8-11 14.146148 14.146148 14.146148 ZT12-15 14.925445499999999 14.925445499999999 14.925445499999999 ZT16-19 19.29021 19.29021 19.29021 ZT20-23 19.751705 19.751705 19.751705