condition mean min max ZT0-3 14.487675000000001 13.664100000000001 15.311250000000001 ZT4-7 11.1845 11.1845 11.1845 ZT8-11 7.483605 7.483605 7.483605 ZT12-15 0 0 0 ZT16-19 9.203444999999999 9.203444999999999 9.203444999999999 ZT20-23 11.83145 11.83145 11.83145