condition mean min max ZT0-3 191.506584 191.506584 191.506584 ZT4-7 160.27995149999998 160.27995149999998 160.27995149999998 ZT8-11 127.40449749999999 127.40449749999999 127.40449749999999 ZT12-15 141.1167575 141.1167575 141.1167575 ZT16-19 154.6750125 154.6750125 154.6750125 ZT20-23 167.7328775 167.7328775 167.7328775