condition mean min max ZT0-3 9.057367500000002 7.0518350000000005 11.0629 ZT4-7 3.66363 3.66363 3.66363 ZT8-11 4.364365 4.364365 4.364365 ZT12-15 0 0 0 ZT16-19 6.824590000000001 6.824590000000001 6.824590000000001 ZT20-23 8.722809999999999 8.722809999999999 8.722809999999999