condition mean min max ZT0-3 10.3634688655 10.071920331000001 10.6550174 ZT4-7 5.576426165499999 5.116380686499999 6.0364716445 ZT8-11 5.5786241925 5.2050705095000005 5.9521778755 ZT12-15 4.2860476135 4.0464109055 4.5256843215 ZT16-19 4.272759123749999 3.7296162015 4.815902046 ZT20-23 8.78736540975 7.750617497 9.8241133225