condition mean min max ZT0-3 14.1473756125 13.55703655 14.737714675 ZT4-7 10.98197992575 10.483392086 11.4805677655 ZT8-11 14.4932812075 11.25408582 17.732476595 ZT12-15 15.3014084 14.68744925 15.91536755 ZT16-19 15.2634388975 13.97426532 16.552612475 ZT20-23 17.94336389 17.41155417 18.47517361