condition mean min max ZT0-3 9.969787 9.969787 9.969787 ZT4-7 10.2707595 10.2707595 10.2707595 ZT8-11 10.0909565 10.0909565 10.0909565 ZT12-15 11.338368 11.338368 11.338368 ZT16-19 10.361106 10.361106 10.361106 ZT20-23 10.2258385 10.2258385 10.2258385