condition mean min max ZT0-3 5.76881 5.76881 5.76881 ZT4-7 3.633035 3.633035 3.633035 ZT8-11 3.303715 3.303715 3.303715 ZT12-15 4.30571 4.30571 4.30571 ZT16-19 6.39614 6.39614 6.39614 ZT20-23 5.391875000000001 5.391875000000001 5.391875000000001