condition mean min max ZT0-3 284.593701 284.593701 284.593701 ZT4-7 240.770604 240.770604 240.770604 ZT8-11 275.3957745 275.3957745 275.3957745 ZT12-15 336.138817 336.138817 336.138817 ZT16-19 383.1147475 383.1147475 383.1147475 ZT20-23 402.512495 402.512495 402.512495