condition mean min max ZT0-3 5.142155000000001 5.142155000000001 5.142155000000001 ZT4-7 3.7072950000000002 3.7072950000000002 3.7072950000000002 ZT8-11 5.14328 5.14328 5.14328 ZT12-15 5.693 5.693 5.693 ZT16-19 8.131314999999999 8.131314999999999 8.131314999999999 ZT20-23 5.50376 5.50376 5.50376