condition mean min max ZT0-3 0.0446877 0.0446877 0.0446877 ZT4-7 0.02820885 0.02820885 0.02820885 ZT8-11 0.0 0.0 0.0 ZT12-15 0.0186571 0.0186571 0.0186571 ZT16-19 0.02476545 0.02476545 0.02476545 ZT20-23 0.03674775 0.03674775 0.03674775