condition mean min max ZT0-3 819.770378 819.770378 819.770378 ZT4-7 601.8222645000001 601.8222645000001 601.8222645000001 ZT8-11 741.6808785 741.6808785 741.6808785 ZT12-15 846.066399 846.066399 846.066399 ZT16-19 1007.1700415 1007.1700415 1007.1700415 ZT20-23 854.0755805 854.0755805 854.0755805