condition mean min max ZT0-3 184.14999999999998 184.14999999999998 184.14999999999998 ZT4-7 182.7 182.7 182.7 ZT8-11 209.55 209.55 209.55 ZT12-15 193.5 193.5 193.5 ZT16-19 223.5 223.5 223.5 ZT20-23 196.25 196.25 196.25