condition mean min max ZT0-3 8.218918333333335 7.528245 8.884115000000001 ZT4-7 7.756225 7.756225 7.756225 ZT8-11 6.894125000000001 6.894125000000001 6.894125000000001 ZT12-15 9.3251175 9.191199999999998 9.459035 ZT16-19 8.83565 8.83565 8.83565 ZT20-23 10.8152 10.8152 10.8152