condition mean min max ZT0-3 0.7110755 0.7110755 0.7110755 ZT4-7 0.2983441 0.2983441 0.2983441 ZT8-11 0.4177925 0.4177925 0.4177925 ZT12-15 0.45947699999999997 0.45947699999999997 0.45947699999999997 ZT16-19 1.1669985 1.1669985 1.1669985 ZT20-23 0.815441 0.815441 0.815441