condition mean min max ZT0-3 7.34062 7.34062 7.34062 ZT4-7 10.147007 10.147007 10.147007 ZT8-11 7.782636500000001 7.782636500000001 7.782636500000001 ZT12-15 7.991994 7.991994 7.991994 ZT16-19 8.3975595 8.3975595 8.3975595 ZT20-23 8.3130205 8.3130205 8.3130205