condition mean min max ZT0-3 0.8227995 0.8227995 0.8227995 ZT4-7 2.061025 2.061025 2.061025 ZT8-11 1.55654 1.55654 1.55654 ZT12-15 1.026375 1.026375 1.026375 ZT16-19 0.520216 0.520216 0.520216 ZT20-23 0.46894800000000003 0.46894800000000003 0.46894800000000003