Dataset:  tunnel_altitude.csv

Source: S. Zhao, S. Wen, Y. Guo,, B. Sun, W. Chen, S. Wang, G. Yabin,
C. Guo (2025). "Impact of High Altitude on Worker Health and Project
Efficiency in Tunnel, Construction," International Journal of
Industrial Ergonomics, Vol. 105, 103694.

Description: Energy Metabolism for 50 workers on tunnels in China.
Factors: 
Altitude 1=High (4400 meters) 2=Plain (518 meters)
Job: 1=Secondary Lining Rebar Installation
     2=Laying of secondary lining water proof cloth
     3=Inverted Arch Rebar Tying
     4=Foundation Slab Construction
     5=Machine Operator
Data generated to match means and sds

Variable Names
altitude
job
energyMet   (kJ/min*m^2)