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| Source | Efficiency measurement method | Research interval | Research subjects | Innovation efficiency value | Influencing factors |
|
| Zhong et al. [12] | DEA | 2004 | Provincial manufacturing in China | Innovation efficiency: 0.476–1 | |
| Song et al. [13] | DEA | 2003–2008 | Large and medium-sized industrial enterprises in China | Innovation efficiency: 0.005–1 | Positive factors: Financial constraints, firm size, and regional factors |
| Negative factors: Fixed assets |
| Zhou et al. [14] | DEA | 1996–2018 | Provincial industrial enterprises in China | Green innovation efficiency: 0.166–1 | Positive factors: Government support for technology, government environmental protection, and technological awareness |
| Guan and chen [15] | Two-stage DEA | 2002–2003 | High-tech industry in China | Full efficiency: 0.253–1.0 | Positive factors: Business environment and industrial investment |
| R&D efficiency: 0.146–1.0 | Negative factors: Government investment |
| Chiu et al. [16] | Two-stage DEA | 2004–2007 | China’s two-digit high-tech industry | R&D efficiency: 0.162–1 | |
| Operational efficiency: 0.111–1 |
| Xiao et al. [17] | Two-stage DEA | 2005–2010 | Large and medium-sized industrial enterprises in China | Overall innovation efficiency: 0.694 | Factors affecting R&D efficiency: Firm size (positive) and number of scientists (negative) |
| Factors affecting overall efficiency: Firm size (positive) and government support (negative) |
| Yu et al. [1] | Meta-frontier DEA | 2001–2017 | Large and medium-sized industrial enterprises in China | Average R&D efficiency: 0.683 | Positive factors affecting R&D efficiency: Ownership structure, foreign investment, and technology trading environment |
| Average green conversion efficiency of results: 0.656 | Factors affecting the efficiency of results conversion: Technology trading environment (positive) and firm size and ownership structure (negative) |
| Dong and Wu [18] | SFA | 1998–2018 | Large and medium-sized industrial enterprises in China | Innovation efficiency: 0.3585–0.7122 | Positive factors: Proportion of private economy and level of economic development |
| Negative factors: Government R&D investment |
| Sun, Chen [19] | SFA | 1999–2008 | Large and medium-sized industrial enterprises in China | Average innovation efficiency: 0.4514 | Positive factors: Open innovation systems, mature technology markets, intellectual property protection, and cooperation networks for innovation systems |
| Negative factor: Government technology investment |
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