condition mean min max ZT0-3 1.1212856666666666 0.444997 1.693775 ZT4-7 0.9714465 0.9714465 0.9714465 ZT8-11 1.18372 1.18372 1.18372 ZT12-15 1.7717 1.70303 1.84037 ZT16-19 1.932475 1.932475 1.932475 ZT20-23 2.117255 2.117255 2.117255