condition mean min max ZT0-3 846.137495 846.137495 846.137495 ZT4-7 716.64536 716.64536 716.64536 ZT8-11 619.34322 619.34322 619.34322 ZT12-15 763.5790585 763.5790585 763.5790585 ZT16-19 698.3707665 698.3707665 698.3707665 ZT20-23 683.4118435 683.4118435 683.4118435