condition mean min max ZT0-3 0.22390916666666666 0.0673785 0.40647500000000003 ZT4-7 0.063595 0.063595 0.063595 ZT8-11 0.38684399999999997 0.38684399999999997 0.38684399999999997 ZT12-15 0.8737947500000001 0.823 0.9245895000000001 ZT16-19 0.8558345 0.8558345 0.8558345 ZT20-23 1.0962565 1.0962565 1.0962565