condition mean min max ZT0-3 12.545324999999998 11.194949999999999 13.8957 ZT4-7 8.07015 8.07015 8.07015 ZT8-11 5.726735 5.726735 5.726735 ZT12-15 0 0 0 ZT16-19 7.836925 7.836925 7.836925 ZT20-23 9.74207 9.74207 9.74207