This call by default returns data for five minutes, so you have five one-minute samples at the time ts in each sample, they are all 'accurate' for their respective ts. If you use the t0, t1, or timespan parameters you can get data for a different period. If what you are interested in is long term info to generate graphs, look for performance issues etc., I suggest also look at https://developer.cisco.com/meraki/api-v1/#!get-device-loss-and-latency-history which allows you to specify sample resolution and gives extra metrics.
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