condition mean min max ZT0-3 0.2761255 0.13641 0.4471035 ZT4-7 0.4159235 0.4159235 0.4159235 ZT8-11 0.7340625 0.7340625 0.7340625 ZT12-15 0.21339624999999998 0.0915585 0.335234 ZT16-19 0.0887095 0.0887095 0.0887095 ZT20-23 0.3894225 0.3894225 0.3894225