condition mean min max ZT0-3 3.693445 3.352755 4.034135 ZT4-7 2.50401 2.50401 2.50401 ZT8-11 2.312895 2.312895 2.312895 ZT12-15 0 0 0 ZT16-19 3.8407 3.8407 3.8407 ZT20-23 3.535655 3.535655 3.535655