condition mean min max ZT0-3 15.57295 15.57295 15.57295 ZT4-7 10.525668 10.525668 10.525668 ZT8-11 9.489608 9.489608 9.489608 ZT12-15 58.259728 58.259728 58.259728 ZT16-19 9.474731 9.474731 9.474731 ZT20-23 11.5497135 11.5497135 11.5497135