condition mean min max ZT0-3 5.99345 5.99345 5.99345 ZT4-7 4.56056 4.56056 4.56056 ZT8-11 3.95647 3.95647 3.95647 ZT12-15 5.920665 5.920665 5.920665 ZT16-19 6.92887 6.92887 6.92887 ZT20-23 6.41289 6.41289 6.41289