condition mean min max ZT0-3 10.7198 10.7198 10.7198 ZT4-7 8.05548 8.05548 8.05548 ZT8-11 8.24057 8.24057 8.24057 ZT12-15 9.881045 9.881045 9.881045 ZT16-19 12.77085 12.77085 12.77085 ZT20-23 10.8491 10.8491 10.8491