condition mean min max ZT0-3 194.078211 194.078211 194.078211 ZT4-7 238.279881 238.279881 238.279881 ZT8-11 171.6897065 171.6897065 171.6897065 ZT12-15 176.020458 176.020458 176.020458 ZT16-19 88.4685205 88.4685205 88.4685205 ZT20-23 78.46826 78.46826 78.46826