condition mean min max ZT0-3 11.311203 11.311203 11.311203 ZT4-7 11.9765175 11.9765175 11.9765175 ZT8-11 11.013111 11.013111 11.013111 ZT12-15 9.895622 9.895622 9.895622 ZT16-19 10.630887000000001 10.630887000000001 10.630887000000001 ZT20-23 10.585709000000001 10.585709000000001 10.585709000000001