condition mean min max ZT0-3 40.3129 39.95555 40.67025 ZT4-7 73.1772 73.1772 73.1772 ZT8-11 70.29525000000001 70.29525000000001 70.29525000000001 ZT12-15 0 0 0 ZT16-19 61.1465 61.1465 61.1465 ZT20-23 59.82815 59.82815 59.82815