condition mean min max ZT0-3 125.713232 125.713232 125.713232 ZT4-7 155.903566 155.903566 155.903566 ZT8-11 181.4697455 181.4697455 181.4697455 ZT12-15 209.13082050000003 209.13082050000003 209.13082050000003 ZT16-19 166.05069650000002 166.05069650000002 166.05069650000002 ZT20-23 125.6967445 125.6967445 125.6967445