condition mean min max ZT0-3 25.548074999999997 24.722949999999997 26.3732 ZT4-7 27.57965 27.57965 27.57965 ZT8-11 22.0157 22.0157 22.0157 ZT12-15 0 0 0 ZT16-19 21.109 21.109 21.109 ZT20-23 31.66535 31.66535 31.66535