condition mean min max ZT0-3 16.030375 14.417300000000001 17.64345 ZT4-7 12.5894 12.5894 12.5894 ZT8-11 11.35345 11.35345 11.35345 ZT12-15 0 0 0 ZT16-19 12.7006 12.7006 12.7006 ZT20-23 13.5268 13.5268 13.5268