condition mean min max ZT0-3 15.838450000000002 15.838450000000002 15.838450000000002 ZT4-7 15.34895 15.34895 15.34895 ZT8-11 14.9482 14.9482 14.9482 ZT12-15 16.5484 16.5484 16.5484 ZT16-19 16.6834 16.6834 16.6834 ZT20-23 12.97355 12.97355 12.97355