condition mean min max ZT0-3 0.397719 0.397719 0.397719 ZT4-7 0.31985240000000004 0.31985240000000004 0.31985240000000004 ZT8-11 0.1415218 0.1415218 0.1415218 ZT12-15 0.3178345 0.3178345 0.3178345 ZT16-19 0.245216 0.245216 0.245216 ZT20-23 0.591042 0.591042 0.591042