condition mean min max ZT0-3 3.4190762500000003 1.3673075000000001 5.470845000000001 ZT4-7 3.9225250000000003 3.9225250000000003 3.9225250000000003 ZT8-11 1.7573605 1.7573605 1.7573605 ZT12-15 0 0 0 ZT16-19 1.859455 1.859455 1.859455 ZT20-23 1.845335 1.845335 1.845335