condition mean min max ZT0-3 0.218419 0.21684900000000001 0.219989 ZT4-7 0.8176405 0.8176405 0.8176405 ZT8-11 0.6260185 0.6260185 0.6260185 ZT12-15 0 0 0 ZT16-19 0.4643295 0.4643295 0.4643295 ZT20-23 0.4346675 0.4346675 0.4346675