condition mean min max ZT0-3 146.39839 146.39839 146.39839 ZT4-7 155.48696 155.48696 155.48696 ZT8-11 157.830029 157.830029 157.830029 ZT12-15 174.1362315 174.1362315 174.1362315 ZT16-19 155.4401305 155.4401305 155.4401305 ZT20-23 131.945995 131.945995 131.945995