condition mean min max ZT0-3 0.3007885 0.299244 0.302333 ZT4-7 0.3284885 0.3284885 0.3284885 ZT8-11 0.4362195 0.4362195 0.4362195 ZT12-15 0 0 0 ZT16-19 0.43233049999999995 0.43233049999999995 0.43233049999999995 ZT20-23 0.406098 0.406098 0.406098