condition mean min max ZT0-3 740.664195 740.664195 740.664195 ZT4-7 541.7565999999999 541.7565999999999 541.7565999999999 ZT8-11 512.5178545 512.5178545 512.5178545 ZT12-15 632.961687 632.961687 632.961687 ZT16-19 569.005907 569.005907 569.005907 ZT20-23 572.6831099999999 572.6831099999999 572.6831099999999