condition mean min max ZT0-3 9.72060748625 4.469430172499999 14.9717848 ZT4-7 9.278107427750001 7.5266310505 11.029583805000001 ZT8-11 8.270411988749998 8.07467344 8.466150537499999 ZT12-15 2.88613434475 1.922222416 3.8500462735 ZT16-19 4.33229910575 2.7248339325 5.939764279 ZT20-23 24.09544893425 15.484411153500002 32.706486715