condition mean min max ZT0-3 200.271011 200.271011 200.271011 ZT4-7 196.4946165 196.4946165 196.4946165 ZT8-11 202.5443085 202.5443085 202.5443085 ZT12-15 236.65356100000002 236.65356100000002 236.65356100000002 ZT16-19 258.7757415 258.7757415 258.7757415 ZT20-23 321.4181 321.4181 321.4181