condition mean min max ZT0-3 114.7 114.7 114.7 ZT4-7 117.2 117.2 117.2 ZT8-11 141.15 141.15 141.15 ZT12-15 253.4 253.4 253.4 ZT16-19 224.85 224.85 224.85 ZT20-23 135.05 135.05 135.05