condition mean min max ZT0-3 11.040988 11.040988 11.040988 ZT4-7 12.2650925 12.2650925 12.2650925 ZT8-11 11.3747765 11.3747765 11.3747765 ZT12-15 11.6164575 11.6164575 11.6164575 ZT16-19 11.186111 11.186111 11.186111 ZT20-23 10.504735 10.504735 10.504735