condition mean min max ZT0-3 5361.233858 5361.233858 5361.233858 ZT4-7 1994.227218 1994.227218 1994.227218 ZT8-11 2253.7477790000003 2253.7477790000003 2253.7477790000003 ZT12-15 2739.171276 2739.171276 2739.171276 ZT16-19 3549.6303234999996 3549.6303234999996 3549.6303234999996 ZT20-23 4468.089358499999 4468.089358499999 4468.089358499999