condition mean min max ZT0-3 189.82175 167.674 211.9695 ZT4-7 239.097 239.097 239.097 ZT8-11 269.052 269.052 269.052 ZT12-15 0 0 0 ZT16-19 337.3105 337.3105 337.3105 ZT20-23 273.0335 273.0335 273.0335