condition mean min max ZT0-3 17.24701 17.24701 17.24701 ZT4-7 21.632841499999998 21.632841499999998 21.632841499999998 ZT8-11 18.90111 18.90111 18.90111 ZT12-15 16.474415 16.474415 16.474415 ZT16-19 18.132357499999998 18.132357499999998 18.132357499999998 ZT20-23 15.9366245 15.9366245 15.9366245