condition mean min max ZT0-3 9.012401666666667 8.133469999999999 10.459900000000001 ZT4-7 9.22637 9.22637 9.22637 ZT8-11 8.82558 8.82558 8.82558 ZT12-15 12.051175 11.352450000000001 12.7499 ZT16-19 12.72845 12.72845 12.72845 ZT20-23 10.728695 10.728695 10.728695