condition mean min max ZT0-3 7.17492 7.17492 7.17492 ZT4-7 5.59811 5.59811 5.59811 ZT8-11 4.909644999999999 4.909644999999999 4.909644999999999 ZT12-15 6.533799999999999 6.533799999999999 6.533799999999999 ZT16-19 8.465005 8.465005 8.465005 ZT20-23 8.11992 8.11992 8.11992