condition mean min max ZT0-3 10.1270425 9.787765 10.46632 ZT4-7 16.86965 16.86965 16.86965 ZT8-11 21.602600000000002 21.602600000000002 21.602600000000002 ZT12-15 0 0 0 ZT16-19 15.591349999999998 15.591349999999998 15.591349999999998 ZT20-23 15.0839 15.0839 15.0839