condition mean min max ZT0-3 31.5942 31.5942 31.5942 ZT4-7 55.8721 55.8721 55.8721 ZT8-11 29.3394 29.3394 29.3394 ZT12-15 16.97315 16.97315 16.97315 ZT16-19 12.78715 12.78715 12.78715 ZT20-23 13.278649999999999 13.278649999999999 13.278649999999999