Table 3 The hierarchy of causative factors of crane accidents.

From: Intelligent identification of causative factors and construction of accident chain for crane operation

The hierarchy

L1

L2

L3

L4

L5

Causative factors

B1、B2、B3、B4

A1、A2、C2、C3、C4

A3、A4、A5、C1

D1、D2、D3、D4、D5、D6

D7

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