condition mean min max ZT0-3 24.473300000000002 21.5993 27.3473 ZT4-7 19.2119 19.2119 19.2119 ZT8-11 19.99055 19.99055 19.99055 ZT12-15 0 0 0 ZT16-19 23.4003 23.4003 23.4003 ZT20-23 26.4488 26.4488 26.4488