condition mean min max ZT0-3 17.097949999999997 16.53095 17.664949999999997 ZT4-7 15.0235 15.0235 15.0235 ZT8-11 14.774149999999999 14.774149999999999 14.774149999999999 ZT12-15 0 0 0 ZT16-19 17.3447 17.3447 17.3447 ZT20-23 15.4673 15.4673 15.4673