condition mean min max ZT0-3 14.640041 14.640041 14.640041 ZT4-7 10.7376085 10.7376085 10.7376085 ZT8-11 11.8385155 11.8385155 11.8385155 ZT12-15 17.2231845 17.2231845 17.2231845 ZT16-19 15.4018905 15.4018905 15.4018905 ZT20-23 15.005925 15.005925 15.005925