condition mean min max ZT0-3 0.035668918 0.030418261 0.040919575 ZT4-7 0.42652814475 0.2418342475 0.6112220420000001 ZT8-11 1.9296063675 1.5101534559999998 2.349059279 ZT12-15 4.056111185000001 3.3366683120000005 4.775554058 ZT16-19 5.79395347675 4.6018600195 6.986046934 ZT20-23 8.17117191 7.900498991999999 8.441844828