condition mean min max ZT0-3 0.025563433333333337 0.01644 0.03468686666666667 ZT4-7 0.0199703 0.0199703 0.0199703 ZT8-11 0.0 0.0 0.0 ZT12-15 0.003653025 0.0 0.00730605 ZT16-19 0.0 0.0 0.0 ZT20-23 0 0 0