condition mean min max ZT0-3 54.684025 54.684025 54.684025 ZT4-7 51.807575 51.807575 51.807575 ZT8-11 66.84225 66.84225 66.84225 ZT12-15 75.142275 75.142275 75.142275 ZT16-19 56.4461 56.4461 56.4461 ZT20-23 55.947975 55.947975 55.947975