condition mean min max ZT0-3 9.457985 9.457985 9.457985 ZT4-7 6.782265000000001 6.782265000000001 6.782265000000001 ZT8-11 9.34651 9.34651 9.34651 ZT12-15 14.7541 14.7541 14.7541 ZT16-19 18.8076 18.8076 18.8076 ZT20-23 10.72813 10.72813 10.72813