condition mean min max ZT0-3 11.380626666666666 10.10168 12.91325 ZT4-7 13.0989 13.0989 13.0989 ZT8-11 10.048475 10.048475 10.048475 ZT12-15 13.20055 12.239049999999999 14.16205 ZT16-19 11.48075 11.48075 11.48075 ZT20-23 9.735735 9.735735 9.735735