condition mean min max ZT0-3 10.812085 10.36237 11.261800000000001 ZT4-7 10.212060000000001 10.212060000000001 10.212060000000001 ZT8-11 5.994484999999999 5.994484999999999 5.994484999999999 ZT12-15 0 0 0 ZT16-19 10.169039999999999 10.169039999999999 10.169039999999999 ZT20-23 9.542735 9.542735 9.542735