condition mean min max ZT0-3 13.33255 13.33255 13.33255 ZT4-7 8.080335 8.080335 8.080335 ZT8-11 7.38013 7.38013 7.38013 ZT12-15 7.8289100000000005 7.8289100000000005 7.8289100000000005 ZT16-19 13.43085 13.43085 13.43085 ZT20-23 13.55845 13.55845 13.55845