condition mean min max ZT0-3 2.9960466666666665 2.234365 3.451315 ZT4-7 0.8410995000000001 0.8410995000000001 0.8410995000000001 ZT8-11 2.409845 2.409845 2.409845 ZT12-15 3.5999325000000004 2.251585 4.9482800000000005 ZT16-19 4.36006 4.36006 4.36006 ZT20-23 3.27916 3.27916 3.27916