condition mean min max ZT0-3 28.539192 28.539192 28.539192 ZT4-7 46.32510550000001 46.32510550000001 46.32510550000001 ZT8-11 53.6129965 53.6129965 53.6129965 ZT12-15 36.2813455 36.2813455 36.2813455 ZT16-19 28.405309000000003 28.405309000000003 28.405309000000003 ZT20-23 26.7194565 26.7194565 26.7194565