condition mean min max ZT0-3 46.24 46.24 46.24 ZT4-7 55.77777777666667 55.77777777666667 55.77777777666667 ZT8-11 41.394999999999996 41.394999999999996 41.394999999999996 ZT12-15 46.64777778 46.64777778 46.64777778 ZT16-19 34.861111109999996 34.861111109999996 34.861111109999996 ZT20-23 41.217777776666665 41.217777776666665 41.217777776666665