condition mean min max ZT0-3 1.1213332500000002 0.7954815 1.4471850000000002 ZT4-7 0.7722205 0.7722205 0.7722205 ZT8-11 1.796175 1.796175 1.796175 ZT12-15 0 0 0 ZT16-19 1.539055 1.539055 1.539055 ZT20-23 1.914345 1.914345 1.914345