condition mean min max ZT0-3 7.51392 5.937844999999999 10.23425 ZT4-7 7.86245 7.86245 7.86245 ZT8-11 11.0555 11.0555 11.0555 ZT12-15 10.14947 9.869295000000001 10.429645 ZT16-19 7.72193 7.72193 7.72193 ZT20-23 9.312190000000001 9.312190000000001 9.312190000000001