condition mean min max ZT0-3 2.8005 2.378545 3.222455 ZT4-7 1.61515 1.61515 1.61515 ZT8-11 4.031225 4.031225 4.031225 ZT12-15 0 0 0 ZT16-19 2.3799 2.3799 2.3799 ZT20-23 2.386975 2.386975 2.386975