condition mean min max ZT0-3 7.1558399999999995 6.95946 7.35222 ZT4-7 5.14417 5.14417 5.14417 ZT8-11 5.814455000000001 5.814455000000001 5.814455000000001 ZT12-15 0 0 0 ZT16-19 11.623999999999999 11.623999999999999 11.623999999999999 ZT20-23 8.64807 8.64807 8.64807