condition mean min max ZT0-3 1.09692075 0.8727564999999999 1.321085 ZT4-7 2.13277 2.13277 2.13277 ZT8-11 4.19391 4.19391 4.19391 ZT12-15 0 0 0 ZT16-19 2.24762 2.24762 2.24762 ZT20-23 2.0977699999999997 2.0977699999999997 2.0977699999999997