condition mean min max ZT0-3 898.7 898.7 898.7 ZT4-7 965.6 965.6 965.6 ZT8-11 1144.4 1144.4 1144.4 ZT12-15 1249.25 1249.25 1249.25 ZT16-19 1232.8 1232.8 1232.8 ZT20-23 1016.15 1016.15 1016.15