condition mean min max ZT0-3 0.165539988 0.046679515 0.284400461 ZT4-7 0.39728426875 0.3829996375 0.4115689 ZT8-11 1.33024190325 0.917203841 1.7432799655 ZT12-15 3.62391637375 2.3148520990000003 4.9329806485 ZT16-19 4.467405991 4.1113811335 4.823430848499999 ZT20-23 4.5822753395 4.2490333735 4.9155173055