condition mean min max ZT0-3 3.1081326734999997 2.5848475779999998 3.6314177689999996 ZT4-7 1.85749149525 1.593498185 2.1214848054999997 ZT8-11 2.76984999025 2.294437314 3.2452626664999995 ZT12-15 2.298157153 2.0248592679999997 2.571455038 ZT16-19 3.7116682885000003 3.59682701 3.8265095670000004 ZT20-23 3.544979746 3.4287080779999997 3.661251414