condition mean min max ZT0-3 121.001288 121.001288 121.001288 ZT4-7 217.3488695 217.3488695 217.3488695 ZT8-11 292.18505 292.18505 292.18505 ZT12-15 249.0148615 249.0148615 249.0148615 ZT16-19 232.3950345 232.3950345 232.3950345 ZT20-23 194.774828 194.774828 194.774828