condition mean min max ZT0-3 1.9260106666666665 1.554575 2.320785 ZT4-7 0.0 0.0 0.0 ZT8-11 1.995285 1.995285 1.995285 ZT12-15 2.6222525 2.30435 2.940155 ZT16-19 3.296965 3.296965 3.296965 ZT20-23 3.68286 3.68286 3.68286