condition mean min max ZT0-3 5.0231875 4.764424999999999 5.28195 ZT4-7 5.69496 5.69496 5.69496 ZT8-11 9.50482 9.50482 9.50482 ZT12-15 0 0 0 ZT16-19 6.614604999999999 6.614604999999999 6.614604999999999 ZT20-23 5.047140000000001 5.047140000000001 5.047140000000001