condition mean min max ZT0-3 595.686632 595.686632 595.686632 ZT4-7 513.157541 513.157541 513.157541 ZT8-11 488.8309285 488.8309285 488.8309285 ZT12-15 511.94123349999995 511.94123349999995 511.94123349999995 ZT16-19 686.802012 686.802012 686.802012 ZT20-23 790.25094 790.25094 790.25094