condition mean min max ZT0-3 78.903375 68.23245 89.5743 ZT4-7 70.4834 70.4834 70.4834 ZT8-11 19.469749999999998 19.469749999999998 19.469749999999998 ZT12-15 0 0 0 ZT16-19 8.354715 8.354715 8.354715 ZT20-23 48.14405 48.14405 48.14405