condition mean min max ZT0-3 0.4170758333333333 0.2865245 0.5926819999999999 ZT4-7 0.4286775 0.4286775 0.4286775 ZT8-11 0.9283429999999999 0.9283429999999999 0.9283429999999999 ZT12-15 0.9024574999999999 0.8329219999999999 0.971993 ZT16-19 0.7455305 0.7455305 0.7455305 ZT20-23 1.234455 1.234455 1.234455