condition mean min max ZT0-3 9.331015 9.11253 9.5495 ZT4-7 9.3608 9.3608 9.3608 ZT8-11 13.49705 13.49705 13.49705 ZT12-15 0 0 0 ZT16-19 14.949000000000002 14.949000000000002 14.949000000000002 ZT20-23 14.0062 14.0062 14.0062