condition mean min max ZT0-3 4.902975 4.704079999999999 5.10187 ZT4-7 4.364115 4.364115 4.364115 ZT8-11 5.86176 5.86176 5.86176 ZT12-15 0 0 0 ZT16-19 6.29316 6.29316 6.29316 ZT20-23 5.826995 5.826995 5.826995