condition mean min max ZT0-3 229.078211 229.078211 229.078211 ZT4-7 141.59464200000002 141.59464200000002 141.59464200000002 ZT8-11 155.7475785 155.7475785 155.7475785 ZT12-15 183.27291250000002 183.27291250000002 183.27291250000002 ZT16-19 251.48304000000002 251.48304000000002 251.48304000000002 ZT20-23 265.4301325 265.4301325 265.4301325