condition mean min max ZT0-3 8.692532499999999 8.611775 8.77329 ZT4-7 11.37201 11.37201 11.37201 ZT8-11 6.263260000000001 6.263260000000001 6.263260000000001 ZT12-15 0 0 0 ZT16-19 4.60621 4.60621 4.60621 ZT20-23 7.6243099999999995 7.6243099999999995 7.6243099999999995