condition mean min max ZT0-3 9.21389 9.21389 9.21389 ZT4-7 5.032765 5.032765 5.032765 ZT8-11 4.49847 4.49847 4.49847 ZT12-15 6.470935000000001 6.470935000000001 6.470935000000001 ZT16-19 11.3494 11.3494 11.3494 ZT20-23 10.56415 10.56415 10.56415