condition mean min max ZT0-3 9.434674999999999 9.434674999999999 9.434674999999999 ZT4-7 12.383099999999999 12.383099999999999 12.383099999999999 ZT8-11 6.339135000000001 6.339135000000001 6.339135000000001 ZT12-15 5.76396 5.76396 5.76396 ZT16-19 6.963355 6.963355 6.963355 ZT20-23 8.290465 8.290465 8.290465