condition mean min max ZT0-3 113.693595 113.693595 113.693595 ZT4-7 64.089568 64.089568 64.089568 ZT8-11 68.08843999999999 68.08843999999999 68.08843999999999 ZT12-15 83.75497899999999 83.75497899999999 83.75497899999999 ZT16-19 104.2999745 104.2999745 104.2999745 ZT20-23 81.5028605 81.5028605 81.5028605