condition mean min max ZT0-3 151.051402 151.051402 151.051402 ZT4-7 155.302395 155.302395 155.302395 ZT8-11 194.466646 194.466646 194.466646 ZT12-15 192.351655 192.351655 192.351655 ZT16-19 221.603363 221.603363 221.603363 ZT20-23 221.6861075 221.6861075 221.6861075