condition mean min max ZT0-3 24.933799999999998 24.23875 25.62885 ZT4-7 18.908450000000002 18.908450000000002 18.908450000000002 ZT8-11 24.89735 24.89735 24.89735 ZT12-15 0 0 0 ZT16-19 28.7175 28.7175 28.7175 ZT20-23 28.6834 28.6834 28.6834