condition mean min max ZT0-3 259.999579 259.999579 259.999579 ZT4-7 264.0389735 264.0389735 264.0389735 ZT8-11 264.0200115 264.0200115 264.0200115 ZT12-15 277.6728205 277.6728205 277.6728205 ZT16-19 241.944342 241.944342 241.944342 ZT20-23 241.28426 241.28426 241.28426