start_time,end_time,action,is_fall
0,9,None,False
10,11,Stand,False
12,16,None,False
17,19,Stand,False
20,29,None,False
30,32,Stand,False
33,33,Stand-Sit,False
34,36,Sit,False
37,40,Stand,False
41,44,None,False
45,46,Stand-Lie,True
47,47,Sit-Stand,False
48,48,Stand,False