condition mean min max ZT0-3 12.43557 12.43557 12.43557 ZT4-7 13.6724565 13.6724565 13.6724565 ZT8-11 12.9319835 12.9319835 12.9319835 ZT12-15 11.312773 11.312773 11.312773 ZT16-19 12.4068495 12.4068495 12.4068495 ZT20-23 12.229412499999999 12.229412499999999 12.229412499999999