condition mean min max ZT0-3 0.8691973333333334 0.5923419999999999 1.0951325 ZT4-7 0.56424 0.56424 0.56424 ZT8-11 0.262874 0.262874 0.262874 ZT12-15 0.34346325 0.271966 0.4149605 ZT16-19 0.525225 0.525225 0.525225 ZT20-23 0.9116075 0.9116075 0.9116075