condition mean min max ZT0-3 4.1707175 3.51893 4.822505 ZT4-7 4.657675 4.657675 4.657675 ZT8-11 6.335205 6.335205 6.335205 ZT12-15 0 0 0 ZT16-19 6.69509 6.69509 6.69509 ZT20-23 5.8374749999999995 5.8374749999999995 5.8374749999999995