condition mean min max ZT0-3 8.39573 8.39573 8.39573 ZT4-7 11.79985 11.79985 11.79985 ZT8-11 8.83017 8.83017 8.83017 ZT12-15 6.069929999999999 6.069929999999999 6.069929999999999 ZT16-19 5.171735 5.171735 5.171735 ZT20-23 4.98255 4.98255 4.98255