condition mean min max ZT0-3 16.714488333333332 7.752414999999999 21.9272 ZT4-7 8.99766 8.99766 8.99766 ZT8-11 12.0225 12.0225 12.0225 ZT12-15 13.4581 12.9283 13.9879 ZT16-19 17.263150000000003 17.263150000000003 17.263150000000003 ZT20-23 26.67905 26.67905 26.67905