condition mean min max ZT0-3 17.0321 16.5286 17.5356 ZT4-7 18.545 18.545 18.545 ZT8-11 6.5672049999999995 6.5672049999999995 6.5672049999999995 ZT12-15 0 0 0 ZT16-19 8.254555 8.254555 8.254555 ZT20-23 16.1964 16.1964 16.1964