condition mean min max ZT0-3 4875.456616 4875.456616 4875.456616 ZT4-7 3118.42166 3118.42166 3118.42166 ZT8-11 2736.214446 2736.214446 2736.214446 ZT12-15 2973.830373 2973.830373 2973.830373 ZT16-19 4984.5821035 4984.5821035 4984.5821035 ZT20-23 6105.1317755 6105.1317755 6105.1317755