condition mean min max ZT0-3 20.02775 20.02775 20.02775 ZT4-7 17.7202 17.7202 17.7202 ZT8-11 16.7817 16.7817 16.7817 ZT12-15 16.29215 16.29215 16.29215 ZT16-19 18.84185 18.84185 18.84185 ZT20-23 20.4409 20.4409 20.4409