condition mean min max ZT0-3 10.19899 9.28408 11.113900000000001 ZT4-7 6.61806 6.61806 6.61806 ZT8-11 3.78892 3.78892 3.78892 ZT12-15 0 0 0 ZT16-19 5.46715 5.46715 5.46715 ZT20-23 7.41879 7.41879 7.41879