condition mean min max ZT0-3 221.680083825 156.04275805 287.3174096 ZT4-7 87.67383812 80.611301655 94.736374585 ZT8-11 99.51505785250001 88.38262725 110.64748845500002 ZT12-15 88.1317399725 76.037277115 100.22620283 ZT16-19 79.67137332 75.27886562 84.06388102 ZT20-23 58.9078598675 55.835987225 61.979732510000005