condition mean min max ZT0-3 417.4611111 417.4611111 417.4611111 ZT4-7 537.6411111 537.6411111 537.6411111 ZT8-11 502.9522222 502.9522222 502.9522222 ZT12-15 286.8377778 286.8377778 286.8377778 ZT16-19 249.03222223333333 249.03222223333333 249.03222223333333 ZT20-23 307.07888890000004 307.07888890000004 307.07888890000004