condition mean min max ZT0-3 4.6572225000000005 4.1240950000000005 5.1903500000000005 ZT4-7 4.392715000000001 4.392715000000001 4.392715000000001 ZT8-11 12.751999999999999 12.751999999999999 12.751999999999999 ZT12-15 0 0 0 ZT16-19 9.862625000000001 9.862625000000001 9.862625000000001 ZT20-23 6.373305 6.373305 6.373305