condition mean min max ZT0-3 7.619809999999999 7.619809999999999 7.619809999999999 ZT4-7 11.158249999999999 11.158249999999999 11.158249999999999 ZT8-11 6.6559550000000005 6.6559550000000005 6.6559550000000005 ZT12-15 3.7256299999999998 3.7256299999999998 3.7256299999999998 ZT16-19 4.625805 4.625805 4.625805 ZT20-23 5.244315 5.244315 5.244315