condition mean min max ZT0-3 6.606233333333333 4.532674999999999 8.353845 ZT4-7 4.939165 4.939165 4.939165 ZT8-11 4.129105 4.129105 4.129105 ZT12-15 7.903560000000001 7.343865 8.463255 ZT16-19 5.76277 5.76277 5.76277 ZT20-23 8.992335 8.992335 8.992335