condition mean min max ZT0-3 11.21185 11.13025 11.29345 ZT4-7 10.63268 10.63268 10.63268 ZT8-11 7.474489999999999 7.474489999999999 7.474489999999999 ZT12-15 0 0 0 ZT16-19 10.350480000000001 10.350480000000001 10.350480000000001 ZT20-23 10.79795 10.79795 10.79795