原因是有关已发送消息的统计信息是实时更新的，而不是已接收，印象和打开的消息的统计信息.我第二天得到这些统计数据.

The reason is that statistic about message sended are updated in real-time, instead received, impression and message opened do not. I get these statistic the next day.

请注意，对于数据消息"，必须在消息中设置"analytics_label"字段才能查看统计信息.对于通知消息"，查看统计信息不是必须的.

Please note that for "Data Message" you have to set in the message the field "analytics_label" in order to see statistics. For "Notification message" this should not be mandatory to see statistics.