condition mean min max ZT0-3 9.376940000000001 8.905560000000001 9.848320000000001 ZT4-7 4.91798 4.91798 4.91798 ZT8-11 5.52332 5.52332 5.52332 ZT12-15 0 0 0 ZT16-19 9.474575 9.474575 9.474575 ZT20-23 6.939715 6.939715 6.939715