condition mean min max ZT0-3 150.007481 150.007481 150.007481 ZT4-7 157.8496095 157.8496095 157.8496095 ZT8-11 284.6974335 284.6974335 284.6974335 ZT12-15 171.3385945 171.3385945 171.3385945 ZT16-19 250.9132035 250.9132035 250.9132035 ZT20-23 195.167646 195.167646 195.167646