condition mean min max ZT0-3 4.7641849999999994 4.586105 4.942265 ZT4-7 5.522824999999999 5.522824999999999 5.522824999999999 ZT8-11 2.96239 2.96239 2.96239 ZT12-15 0 0 0 ZT16-19 2.43139 2.43139 2.43139 ZT20-23 4.42391 4.42391 4.42391