condition mean min max ZT0-3 26.88653945 24.352952000000002 29.420126899999996 ZT4-7 21.022653482499997 20.070653115 21.97465385 ZT8-11 19.86706548 19.123440095 20.610690865000002 ZT12-15 9.4353210415 6.3852007475 12.4854413355 ZT16-19 9.447423569000001 8.0212600975 10.8735870405 ZT20-23 12.367111294999999 11.796331859999999 12.93789073