condition mean min max ZT0-3 34.520083 34.520083 34.520083 ZT4-7 174.574335 174.574335 174.574335 ZT8-11 191.4055065 191.4055065 191.4055065 ZT12-15 235.1147415 235.1147415 235.1147415 ZT16-19 108.46441899999999 108.46441899999999 108.46441899999999 ZT20-23 82.3280575 82.3280575 82.3280575