condition mean min max ZT0-3 9.669355 9.669355 9.669355 ZT4-7 6.336125 6.336125 6.336125 ZT8-11 4.79984 4.79984 4.79984 ZT12-15 8.262274999999999 8.262274999999999 8.262274999999999 ZT16-19 11.145050000000001 11.145050000000001 11.145050000000001 ZT20-23 9.918185000000001 9.918185000000001 9.918185000000001