condition mean min max ZT0-3 9.868684 9.868684 9.868684 ZT4-7 10.8134035 10.8134035 10.8134035 ZT8-11 10.811579 10.811579 10.811579 ZT12-15 10.1683345 10.1683345 10.1683345 ZT16-19 10.524419 10.524419 10.524419 ZT20-23 10.427084 10.427084 10.427084