condition mean min max ZT0-3 8.0363625 7.795719999999999 8.277004999999999 ZT4-7 5.8789750000000005 5.8789750000000005 5.8789750000000005 ZT8-11 5.99241 5.99241 5.99241 ZT12-15 0 0 0 ZT16-19 9.46215 9.46215 9.46215 ZT20-23 11.31885 11.31885 11.31885