condition mean min max ZT0-3 16.26565 15.82355 16.70775 ZT4-7 14.545300000000001 14.545300000000001 14.545300000000001 ZT8-11 16.12715 16.12715 16.12715 ZT12-15 0 0 0 ZT16-19 15.96545 15.96545 15.96545 ZT20-23 15.511 15.511 15.511