Table 1: Factors affecting labor productivity of construction workers in Vietnam.

	Factors	References
A	Factors relevant to construction worker	Nguyen Thanh Vu (2015) [24]
1	Age	Clarkson, H. O., et al. (1989) [25]; Vy and Yem (2007) [26] Nguyen Ba Vy, et al. (2008) [27]
2	Experiences of workers	Sanders and Thomas (1991) [28]; Enshassi et al. (2007) [29]; Ngo Van Tuan (2018) [5]
3	Gender	The authors proposed
4	Labor discipline	Thomas et al. (1999) [30]
5	Labor intensity	The authors proposed
6	Level of training	Makulsawatudom and Emsley (2002) [31];Vu Quang Lam (2010) [32]
7	Physical ability	The authors proposed
8	Psychophysiology ability	Nguyen Ba Vy, et al. (2007) [27]
B	Factors Relevant to Site Operation and Management	Lim and Alum (1995) [33]; Lema (1995) [34]; Hanna et al. (2005) [35]; Vu Quang Lam (2010) [32]
1	Ability to organize production	The authors proposed
2	Application of technology	Junbok Lee, et al. (2017) [36]
3	Attitude towards employees	Langford D, et al. (1995) [37]; Vu Quang Lam (2010) [32]; Le Van Hung (2016) [38]
4	The manager's experience	Farnad Nasirzadeh and Pouya Nojedehi (2013) [39]
C	Factors Relevant to Motivation	Kazaz A, et al. (2008) [40]
1	Initiative at work	The authors proposed
2	Reward mechanism	Langford D, et al. (1995) [37]; Soekiman A 2009) [41]
3	Spiritual life	The authors proposed
4	Staff support	The authors proposed
5	Training and improving skills	Olomolaiye P, et al. (1988) [42]
6	Types of salary payment	Langford D, et al. (1995) [37]; Kazaz A, et al. (2008) [40]; Loan, T. T. K, et al. (2009) [43]
D	Factors Relevant to Working Time	The authors proposed
1	Break time	The authors proposed
2	Delay time	Thomas HR (1992) [44]; Nguyen Ba Vy, et al. (2007) [27]; Hanna et al. (2005) [35]
3	Number of working hours	Hanna et al. (2005) [35]; Hanna et al. (2008) [45]
4	Operating time	Nguyen Ba Vy, et al. (2007) [27]; Hanna et al. (2005) [35];
5	Preparing and finalizing time	The authors proposed
6	Working mode	Hanna AS, et al. (2008) [45]
E	Factors Relevant to Labor Working Tools	P. Foraboschi (2016) [46], P. Foraboschi (2019) [47], P. Foraboschi (2016) [48]
1	Complexity of works	The authors proposed
2	Material transport methods	The authors proposed
3	Quality of building materials	Nguyen Ba Vy, et al. (2007) [27]; A. Soekiman, et al. (2011) [49], P. Foraboschi (2016) [46], P. Foraboschi (2019) [47]
4	Quality of working tools	Loi, D. N, et al. (2016) [50], P. Foraboschi (2019) [47], P. Foraboschi (2016) [48]
F	Factors Relevant to Labor Working Conditions	Mostafa E. Shehata, et al. (2011) [51]; Hanna AS, et al. (2008) [45]
1	Exposure to toxic substances	Mostafa E. Shehata, et al. (2011) [51]
2	Height of working place	Nguyen Ba Vy, et al. (2007) [27]
3	Intensity of lighting, ventilation	The authors proposed
4	Noise	The authors proposed
5	Working in hazardous areas	Lowe G (1987) [52]
G	Factors Relevant to Working Safety	Makulsawatudom and Emsley (2002) [31]; Adnan Enshassi, et al. (2007) [29]
1	Arrangement of safety staff	The authors proposed
2	Occupational accidents	Ministry of Construction (2016) [53]
3	Regulations on labor safety	The authors proposed
4	Safety equipment	The authors proposed
5	Safety signs	Makulsawatudom and Emsley (2002) [31]; Nguyen Huy Thanh (2016) [23]
6	The sense of observance of regulations by laborers	Kaming PF, et al. (1997) [54]
7	Training on labor safety	The authors proposed
H	Factors Relevant to Project Informations	Olomolaiye P, et al. (1988) [55]
1	Construction method	Olomolaiye, et al. (1996) [20]; Lim and Alum (1995) [33]; Jiukun Dai et al. (2009) [22]
2	Type of activities in the project	The authors proposed
3	Change design	The authors proposed
4	Project scale	Jiukun Dai et al. (2009) [22]; Farnad Nasirzadeh and Pouya Nojedehi (2013) [39]
I	Factors Relevant to Natural Environment	Xiaodong Li, et al. (2016) [56]; Nguyen Huy Thanh (2016) [23]; Le Van Cu (2017) [57]
1	Geological and hydrological conditions	The authors proposed
2	Regulations, laws on construction	Le Van Cu (2017) [57]
3	Weather conditions	Thomas et al. (1999) [30]; Adnan Enshassi, et al. (2007) [29]; Nguyen Huy Thanh (2016) [23];
K	Factors Relevant to Socio-Economic Conditions	Xiaodong Li, et al. (2016) [56]; Nguyen Huy Thanh (2016) [23]; Le Van Cu (2017) [57]
1	Regulations, laws on construction	Le Van Cu (2017) [57]
2	Competition in construction field	The authors proposed