condition mean min max ZT0-3 1219.7 1219.7 1219.7 ZT4-7 993.9 993.9 993.9 ZT8-11 984.0999999999999 984.0999999999999 984.0999999999999 ZT12-15 1080.55 1080.55 1080.55 ZT16-19 1035.1 1035.1 1035.1 ZT20-23 1161.9 1161.9 1161.9