condition mean min max ZT0-3 0.558623 0.558623 0.558623 ZT4-7 1.40828 1.40828 1.40828 ZT8-11 0.970275 0.970275 0.970275 ZT12-15 0.994981 0.994981 0.994981 ZT16-19 0.244713 0.244713 0.244713 ZT20-23 0.4165735 0.4165735 0.4165735