condition mean min max ZT0-3 3.9631783333333335 2.5117000000000003 4.8228 ZT4-7 2.4839450000000003 2.4839450000000003 2.4839450000000003 ZT8-11 2.715055 2.715055 2.715055 ZT12-15 4.069265 3.9739500000000003 4.16458 ZT16-19 4.271205 4.271205 4.271205 ZT20-23 5.429505 5.429505 5.429505