The different sample sizes and length of 20 interventions across the three age groups may have also affected the results .
The 21 reality of the fieldwork environment suggests that these anomalies will be typically 22 encountered in the majority of natural settings .
The different sample sizes and length of 20 interventions across the three age groups may have also affected the results , although the 21 reality of the fieldwork environment suggests that these anomalies will be typically 22 encountered in the majority of natural settings .