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Comparative anthropological studies do show that the social roles assigned to the two sexes are variable to some extent . Although their have been reports of ecdysteroids successfully promoting molting in some nematodes ( 48 ) , the overall effects of ecdysones when added exogenously to various nematode species have been variable ( 47 ) . An operator was carrying reject paper from a guillotine to the conveyor feeding the pulper ( a regular task carried out over a distance of about 30 metres ) , the weight of the paper was variable . The action spectra for iron photodissolution processes have not been determined and likely are variable . RC4 allows the key length to be variable , up to 256 bytes , as opposed to requiring the key to be fixed at a certain length . However , the requirements are variable and merely being licensed is no proof of competence . TUDELFT were variable , sometimes confirming quickly , other times not actually confirming the order was going to be processed until after the article had arrived . The extent of response to placebo in depression trials tends to be variable and unpredictable [ 23 ] , and striking differences can arise in the within-group variability of response to treatment . The grids used by the ground-water flow models were variable in size and cells were not aligned along the same axis . VOS typically provide low-resolution observations and the data quality can be variable . The sector reforms are continuing and progress in their effective implementation has been variable across the regions . Although penetration rates were variable ( as we expected from our previous coring operations in fresh and altered rocks ) , the casing was installed much faster than we anticipated ( 33 hr from start to finish ) , and resulted in a reentry hole , cased to 31 mbsf , in an area of extremely rugged local topography where no conventional reentry system would have had much chance for success . The field can be variable length , up to a maximum of 12 characters . Results are variable . The results have been variable and confusing , not only because the response is weak and difficult to establish in short integrations , but also because it is sensitive to the precise location of the prescribed SST anomaly in relation to the atmospheric jet streams and their associated storm tracks . The number of nodes in the system will be variable : nodes can join and leave any time they like . Allen 's luck has been variable in both his personal and professional life . In a recent study , even a group of breeders that had fairly uniform IBD titers had chicks with titers that were variable , with many chicks have little or no maternal antibody protection . The maize with tillers on the above-ground nodes of the main stem like Tlr ( Neuffer ) were variable in angles . This study found that by aerating or coagulating water , cattle will increase their water intake by 10-20 % over unaerated water ; however , research on weight gains has been variable . Affected broilers had poor pigmentation , poor feed conversion , and lower body weights , and flock uniformity was variable . Epoch length was variable , but appropriately balanced between conditions and ranged from single events to 5 consecutive items . The spacing between the rows was variable , and the spacing between the holes within a row was approximately 500 feet . The echogenicity was variable in these tumors .