condition mean min max ZT0-3 8.323577499999999 7.7934 8.853755 ZT4-7 5.717784999999999 5.717784999999999 5.717784999999999 ZT8-11 4.671950000000001 4.671950000000001 4.671950000000001 ZT12-15 0 0 0 ZT16-19 5.718935 5.718935 5.718935 ZT20-23 5.73343 5.73343 5.73343