condition mean min max ZT0-3 1219.795368 1219.795368 1219.795368 ZT4-7 1250.4743905 1250.4743905 1250.4743905 ZT8-11 1136.0743975 1136.0743975 1136.0743975 ZT12-15 1345.1075455 1345.1075455 1345.1075455 ZT16-19 1113.3432055 1113.3432055 1113.3432055 ZT20-23 1505.405902 1505.405902 1505.405902