condition mean min max ZT0-3 146.574556 146.574556 146.574556 ZT4-7 480.7689095 480.7689095 480.7689095 ZT8-11 358.77842899999996 358.77842899999996 358.77842899999996 ZT12-15 228.64016249999997 228.64016249999997 228.64016249999997 ZT16-19 63.7982345 63.7982345 63.7982345 ZT20-23 44.706823 44.706823 44.706823