condition mean min max ZT0-3 14.395258 14.395258 14.395258 ZT4-7 13.5599065 13.5599065 13.5599065 ZT8-11 12.880643 12.880643 12.880643 ZT12-15 11.4482295 11.4482295 11.4482295 ZT16-19 11.9477975 11.9477975 11.9477975 ZT20-23 13.1045445 13.1045445 13.1045445