condition mean min max ZT0-3 9.138912 9.138912 9.138912 ZT4-7 9.742931500000001 9.742931500000001 9.742931500000001 ZT8-11 10.6431085 10.6431085 10.6431085 ZT12-15 10.501804 10.501804 10.501804 ZT16-19 11.2561655 11.2561655 11.2561655 ZT20-23 10.699528 10.699528 10.699528