condition mean min max ZT0-3 0.45701800000000004 0.300475 0.546398 ZT4-7 0.35437050000000003 0.35437050000000003 0.35437050000000003 ZT8-11 0.3971574 0.3971574 0.3971574 ZT12-15 0.31474274999999996 0.301129 0.3283565 ZT16-19 0.4712835 0.4712835 0.4712835 ZT20-23 0.26722 0.26722 0.26722