condition mean min max ZT0-3 183.623637 183.623637 183.623637 ZT4-7 167.600794 167.600794 167.600794 ZT8-11 141.81679200000002 141.81679200000002 141.81679200000002 ZT12-15 162.765773 162.765773 162.765773 ZT16-19 196.19364050000001 196.19364050000001 196.19364050000001 ZT20-23 253.05222750000001 253.05222750000001 253.05222750000001