Controls were chosen from strata of length 28 days; days either side of the case day were excluded to reduce the correlation between case and control exposure.
The factors affecting the stability of the overburden in solid dense filling mining were also analyzed, including the thickness and elasticity modulus of the main roof strata, overlying strata loads, advanced distance and length of workface, and elastic foundation coefficient of backfill body.
However, we used a pattern-mixture approach (34) to assess the sensitivity of the findings, examining the consistency of results across strata based on length of follow-up, which confirmed the findings (data not shown).
Seaside towns are built on strata upon strata of happy memories; a sort of emotional geology.
Table 5 shows the age-strata-specific discharge disposition and hospital length of stay by insurance category.
Thus rock strata C1 C5−1 is rock strata without deformation pressure.
The metropolitan-urbanized and non-metro urbanized strata both have higher overall impaired stream length (14.00% and 14.20%, respectively) compared to the less-urbanized and thinly populated strata (8.79% and 6.54% respectively) (Table 2).
Statistics of broken lengths of mining-related key strata rupture provides ranges for first rupture L0 of 45 60 m and periodic rupture Lc of 15 30 m.
