condition mean min max ZT0-3 0.0 0.0 0.0 ZT4-7 0.0 0.0 0.0 ZT8-11 0.137108 0.137108 0.137108 ZT12-15 0.376483 0.376483 0.376483 ZT16-19 0.2788745 0.2788745 0.2788745 ZT20-23 0.0492326 0.0492326 0.0492326