condition mean min max ZT0-3 7.16424 7.16424 7.16424 ZT4-7 9.259255 9.259255 9.259255 ZT8-11 5.0866299999999995 5.0866299999999995 5.0866299999999995 ZT12-15 4.19396 4.19396 4.19396 ZT16-19 4.86899 4.86899 4.86899 ZT20-23 6.51304 6.51304 6.51304