condition mean min max ZT0-3 158.954552 158.954552 158.954552 ZT4-7 142.7600215 142.7600215 142.7600215 ZT8-11 134.7067625 134.7067625 134.7067625 ZT12-15 178.010491 178.010491 178.010491 ZT16-19 180.144464 180.144464 180.144464 ZT20-23 192.975757 192.975757 192.975757