condition mean min max ZT0-3 173.546509 173.546509 173.546509 ZT4-7 136.607209 136.607209 136.607209 ZT8-11 83.3357895 83.3357895 83.3357895 ZT12-15 79.657722 79.657722 79.657722 ZT16-19 77.97469050000001 77.97469050000001 77.97469050000001 ZT20-23 84.9498975 84.9498975 84.9498975