A statistical analysis of the data yielded an estimate for the likely survival time of a typical colony of between 12.9 and 15.3 years, and suggested that warm and dry conditions were more favourable for survival than cold, wet ones.

数据统计分析估测了一个典型的聚居群（12.9—15.3年）可能的生存时间。该分析也表明，比起寒冷潮湿的条件，温暖干燥的环境更有利于生存。