condition mean min max ZT0-3 257.522482 257.522482 257.522482 ZT4-7 176.8621495 176.8621495 176.8621495 ZT8-11 187.0292615 187.0292615 187.0292615 ZT12-15 282.9659545 282.9659545 282.9659545 ZT16-19 303.075654 303.075654 303.075654 ZT20-23 328.462826 328.462826 328.462826